Telescopic platform

Abstract

The invention provides a telescopic platform. The telescopic platform is characterized in that a fixed part of a driving assembly is connected with an erecting frame service platform; the bearing platform is connected with the moving part of the driving assembly so as to be driven by the driving assembly to be close to or away from the rocket body. The fence is detachably connected with the bearing platform and is close to the rocket body; the multiple receding openings are formed in the surface of the bearing platform in a penetrating mode, the multiple folding ladders are rotationally arranged on the multiple receding openings correspondingly, in the first state, the multiple folding ladders are vertically arranged below the bearing platform, and in the second state, the multiple folding ladders are folded and rotated to the upper surface of the bearing platform. According to the scheme, the moving part of the driving assembly drives the bearing platform to be close to or away from the rocket body, the bearing platform is close to the rocket body, a worker can conveniently install and debug equipment related to a first-stage liquid oxygen adding and discharging pipeline of a rocket pipeline, and the bearing platform is away from the rocket body, so that the first-stage liquid oxygen adding and discharging pipeline can be conveniently installed and debugged when the rocket takes off. A safe distance is kept from a rocket body, and rocket takeoff safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of launch vehicle technology, and in particular to a telescopic platform. Background Technology

[0002] Before a rocket launch, staff need to install and test the equipment related to the first-stage liquid oxygen filling and emptying pipeline of the rocket using the erector platform. During rocket launch, there will be takeoff drift. To avoid collisions between the rocket and the erector platform due to takeoff drift, a safety distance is set between the existing erector platform and the rocket. This safety distance affects the staff's ability to install and test the equipment related to the first-stage liquid oxygen filling and emptying pipeline of the rocket. Summary of the Invention

[0003] This invention provides a telescopic platform that uses the moving part of a drive component to move the carrying platform closer to or away from the rocket body. When the carrying platform is close to the rocket body, it facilitates the installation and commissioning of equipment related to the primary liquid oxygen filling and draining pipeline of the rocket. When the carrying platform is far away from the rocket body, it can maintain a safe distance from the rocket body during rocket takeoff, ensuring the safety of rocket takeoff.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A telescopic platform, comprising: A drive assembly, wherein the fixing part of the drive assembly is connected to the erection frame service platform; A support platform, which is connected to the movable part of the drive assembly, so as to move closer to or away from the rocket body under the drive of the drive assembly; A fence, which is detachably connected to the support platform, is located near the rocket body; Multiple clearance openings are provided throughout the surface of the support platform and are located close to the fence. Multiple foldable ladders are rotatably positioned at multiple clearance openings. In the first state, the multiple foldable ladders are vertically perpendicular to the bottom of the support platform. In the second state, the multiple foldable ladders are folded and rotated to the upper surface of the support platform.

[0005] Optionally, the carrier platform includes: A support frame, the surface of which is provided with multiple clearance openings; Multiple steel mesh panels are connected to the upper surface of the support frame, and these panels avoid multiple clearance openings.

[0006] Optionally, the drive assembly is provided in two sets, and the moving parts of the two sets of drive assemblies are respectively connected to multiple connecting plates on both sides of the support frame.

[0007] Optionally, the driving component includes: A fixed frame, which is connected to the erection platform; A rack, which is connected to the fixing frame and extends toward the rocket body; A movable plate, which is slidably connected to the fixed frame and connected to the connecting plate; A hydraulic motor is connected to the movable plate, and a drive gear is connected to the output end of the hydraulic motor. The drive gear meshes with the rack.

[0008] Optionally, the driving component further includes: A follower plate, which is slidably connected to the fixed frame and connected to the connecting plate; Driven gear, which is rotatably connected to follower plate, and meshes with rack.

[0009] Optionally, the driving component further includes: The guide rail is connected to the fixing frame. There are two guide rails, which are located on both sides of the rack. Multiple sliders are connected to the moving plate and the follower plate respectively, and the multiple sliders are slidably connected to two guide rails respectively.

[0010] Optionally, the fence includes: Multiple vertical rods are connected to multiple plug-in sleeves on the surface of the support frame. The outer side of the multiple plug-in sleeves is threaded with fastening bolts, and the multiple fastening bolts are in close contact with the multiple vertical rods respectively. Multiple horizontal bars are welded and connected between two adjacent vertical bars.

[0011] Optionally, the telescopic platform further includes: Multiple support frames are welded to the support frame, and the multiple support frames are respectively located in multiple clearance openings; Multiple connecting plates are connected to the upper surface of multiple load-bearing frames, and a third connecting hole is provided through the outer side of each of the multiple connecting plates; Multiple second connecting rods are arranged in an L-shape. The first end of the multiple second connecting rods is welded to the first end of multiple folding ladders. The second end of the multiple second connecting rods is provided with a third through hole. The multiple third through holes correspond to the multiple third connecting holes respectively. The length of the multiple folding ladders after folding is less than the length of the inner cavity of the multiple load-bearing frames. Multiple third connecting bolts, the ends of which pass through the third connecting hole and the third through hole in sequence, and the ends of the multiple third connecting bolts are respectively threaded with a third connecting nut.

[0012] Optional, multiple folding ladders include: The first ladder is welded to the first end of the second connecting rod. The second ladder has its first end rotatably connected to the second end of the first ladder.

[0013] Optionally, the multiple folding ladders may also include: A first through groove is provided at the second end of the first ladder. The first through groove penetrates the outer side of the second end of the first ladder, and a first connecting hole is provided through the inner wall of the first through groove. The second through groove is provided at the first end of the second ladder, and the second through groove penetrates the outer side of the first end of the second ladder. The inner wall of the second through groove is provided with a second connecting hole. A first connecting rod, the first end of the first connecting rod extending into the first through groove, the first end of the first connecting rod having a through hole corresponding to the first connecting hole; the second end of the first connecting rod extending into the second through groove, the second end of the first connecting rod having a through hole corresponding to the second connecting hole; The first connecting bolt has its end passing through the first connecting hole and the first through hole, and the end of the first connecting bolt is threaded with a first connecting nut; The second connecting bolt has its end passing through the second connecting hole and the second through hole, and the end of the second connecting bolt is threaded with a second connecting nut.

[0014] The above-described solution of the present invention has at least the following beneficial effects: The above-described solution of the present invention uses the moving part of the drive component to move the support platform closer to or away from the rocket body. When the support platform is close to the rocket body, it facilitates the installation and debugging of related equipment in the primary liquid oxygen filling and draining pipeline of the rocket. When the support platform is far away from the rocket body, it can maintain a safe distance from the rocket body during rocket takeoff, ensuring the safety of rocket takeoff. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the telescopic platform in its extended state according to an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the telescopic platform in its retracted state, provided in an embodiment of the present invention. Figure 3 This is a three-dimensional structural diagram of the support platform in the telescopic platform provided in an embodiment of the present invention; Figure 4This is a three-dimensional structural diagram of the folding ladder in the telescopic platform provided in an embodiment of the present invention; Figure 5 yes Figure 4 Enlarged schematic diagram of part A; Figure 6 yes Figure 4 Enlarged diagram of part B; Figure 7 This is a three-dimensional structural diagram of the drive component in the telescopic platform provided in an embodiment of the present invention.

[0016] The annotations in the attached figures are explained as follows: 1. Drive assembly; 11. Fixing frame; 12. Rack; 13. Guide rail; 14. Moving plate; 15. Hydraulic motor; 16. Drive gear; 17. Slider; 18. Follower plate; 19. Driven gear; 2. Bearing platform; 21. Bearing frame; 22. Connecting plate; 23. Steel mesh; 24. Clearance opening; 3. Fence; 31. Vertical bar; 32. Horizontal bar; 4. Bearing frame; 5. Folding ladder; 51. First ladder; 511. First through slot; 512. First connecting hole; 52. Second ladder; 521. Second through slot; 522. Second connecting hole; 53. First connecting rod; 54. Second connecting rod; 55. Connecting base plate; 551. Third connecting hole. Detailed Implementation

[0017] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0018] like Figures 1 to 7 As shown, an embodiment of the present invention provides a telescopic platform, comprising: Drive component 1, the fixing part of drive component 1 is connected to the erection frame service platform; The support platform 2 is connected to the moving part of the drive assembly 1 so as to move closer to or away from the rocket body under the drive of the drive assembly 1. Fence 3 is detachably connected to the support platform 2 and is located close to the rocket body; Multiple clearance openings 24 are provided through the surface of the bearing platform 2 and are close to the fence 3; Multiple foldable ladders 5 are rotatably arranged in multiple clearance openings 24. In the first state, the multiple foldable ladders 5 are vertically perpendicular to the bottom of the support platform 2. In the second state, the multiple foldable ladders 5 are folded and rotated to the upper surface of the support platform 2.

[0019] In this embodiment, when it is necessary to install and debug the equipment related to the primary liquid oxygen filling and draining pipeline of the rocket pipeline, the drive component 1 drives the support platform 2 close to the rocket body, installs the fence 3, and adjusts multiple folding ladders 5 so that the folding ladders 5 are in the first state, with the multiple folding ladders 5 vertically below the support platform 2. The staff can approach the rocket body on the support platform 2 or through the multiple folding ladders 5 to install and debug the equipment related to the primary liquid oxygen filling and draining pipeline of the rocket pipeline. The staff can get as close to the rocket body as possible to facilitate the installation and debugging of the equipment related to the primary liquid oxygen filling and draining pipeline. After completing the installation and commissioning of the primary liquid oxygen filling and draining pipeline and related equipment of the rocket pipeline, the operators remove the fence 3 and fold and rotate multiple folding ladders 5 to put them in the second state. The multiple folding ladders 5 are folded and rotated to the upper surface of the support platform 2. Through the drive component 1, the support platform 2 is moved away from the rocket body. This can maintain a safe distance from the rocket body when the rocket takes off, ensuring the safety of the rocket takeoff.

[0020] like Figure 3 As shown, in an optional embodiment of the present invention, the carrier platform 2 includes: The support frame 21 has multiple clearance openings 24 on its surface; Multiple steel mesh panels 23 are connected to the upper surface of the support frame 21, and the multiple steel mesh panels 23 avoid multiple clearance openings 24.

[0021] In this embodiment, the support frame 21 adopts a frame structure formed by aluminum profiles and profile connectors, and multiple steel mesh 23 are connected by intermittent bolts; the mesh size of the steel mesh 23 is less than 20mm.

[0022] like Figures 1 to 3 As shown, in an optional embodiment of the present invention, the drive assembly 1 is provided in two sets, and the moving parts of the two sets of drive assemblies 1 are respectively connected to multiple connecting plates 22 on both sides of the support frame 21.

[0023] In this embodiment, the erecting service platform is provided with a receiving cavity to accommodate the bearing platform 2. Two sets of drive components 1 are connected to the inner walls on both sides of the receiving cavity. The moving parts of the two sets of drive components 1 are respectively connected to multiple connecting plates 22 on both sides of the bearing frame 21. The bearing platform 2 is extended or retracted by the two sets of drive components 1 to ensure the stability of the bearing platform 2.

[0024] like Figure 7 As shown, in an optional embodiment of the present invention, the driving component 1 includes: Fixed frame 11, fixed frame 11 is connected to the erection frame service platform; Rack 12 is connected to the fixing frame 11 and extends into the rocket body; The movable plate 14 is slidably connected to the fixed frame 11 and is connected to the connecting plate 22. A hydraulic motor 15 is connected to a movable plate 14. The output end of the hydraulic motor 15 is connected to a drive gear 16, which meshes with a rack 12.

[0025] In this embodiment, the fixed frame 11 is connected to the erecting frame service platform to ensure the stability of the drive component 1. The hydraulic motor 15 drives the drive gear 16 to rotate. Since the drive gear 16 meshes with the rack 12 and the rack 12 is fixed, the meshing transmission between the drive gear 16 and the rack 12 causes the moving plate 14 to move. The moving plate 14 drives the bearing platform 2 to extend or retract, thereby enabling the bearing platform 2 to move closer to or further away from the rocket body.

[0026] like Figure 7 As shown, in an optional embodiment of the present invention, the driving component 1 further includes: Follower plate 18 is slidably connected to fixed frame 11 and connected to connecting plate 22; Driven gear 19 is rotatably connected to follower plate 18 and meshes with rack 12.

[0027] In this embodiment, the follower plate 18 is connected to the connecting plate 22 to achieve multi-point support of the support frame 21. During the movement of the support frame 21, the follower plate 18 slides with the fixed frame 11, which further improves the stability of the support platform 2. In this embodiment, the follower plate 18 is used as an example. In actual application, the follower plate 18 may not be used. Instead, two sets of hydraulic motors 15, a moving plate 14, and a drive gear 16 are used. The two sets of hydraulic motors 15 operate synchronously to ensure sufficient power for the movement of the bearing platform 2.

[0028] like Figure 7 As shown, in an optional embodiment of the present invention, the driving component 1 further includes: Guide rail 13 is connected to the fixed frame 11. There are two guide rails 13, which are located on both sides of the rack 12. Multiple sliders 17 are connected to the movable plate 14 and the follower plate 18 respectively, and the multiple sliders 17 are slidably connected to two guide rails 13 respectively.

[0029] In this embodiment, the sliding connection between the guide rail 13 and multiple sliders 17 is achieved, thereby enabling the sliding connection between the moving plate 14 and the follower plate 18 and the fixed frame 11. The moving plate 14 and the follower plate 18 move stably, thus further ensuring the movement stability of the bearing platform 2.

[0030] like Figure 3 As shown, in an optional embodiment of the present invention, the fence 3 includes: Multiple vertical rods 31 are connected to multiple plug-in sleeves on the surface of the support frame 21. The outer side of the multiple plug-in sleeves is threaded with fastening bolts, and the multiple fastening bolts are in close contact with the multiple vertical rods 31 respectively. Multiple horizontal bars 32 are welded and connected between two adjacent vertical bars 31.

[0031] In this embodiment, a fence 3 is formed by multiple vertical rods 31 and multiple horizontal rods 32, which ensures the strength of the fence 3 while reducing its weight, making it easier for workers to dismantle and move the fence 3. The fence 3 is stable by connecting multiple vertical rods 31 to multiple plug-in sleeves and locking multiple vertical rods 31 with multiple fastening bolts, while also facilitating the disassembly and installation of the fence 3. The fence 3 is installed when installing and debugging the equipment related to the first-stage liquid oxygen filling and emptying pipeline of the rocket pipeline. After the installation and debugging of the equipment related to the first-stage liquid oxygen filling and emptying pipeline of the rocket pipeline is completed, the support platform 2 needs to be retracted and the fence 3 removed. This ensures that the support platform 2 can accurately retract into the receiving cavity of the erecting frame service platform, avoiding collisions between the fence 3 and other structures of the erecting frame service platform.

[0032] like Figure 4 and Figure 6 As shown, in an optional embodiment of the present invention, the telescopic platform further includes: Multiple load-bearing frames 4 are welded to the load-bearing frame 21, and the multiple load-bearing frames 4 are respectively located in multiple clearance openings 24; Multiple connecting plates 55 are connected to the upper surface of multiple bearing frames 4 respectively, and a third connecting hole 551 is provided through the outer side of each of the multiple connecting plates 55; Multiple second connecting rods 54 are arranged in an L-shape. The first end of the multiple second connecting rods 54 is welded to the first end of the multiple folding ladders 5. The second end of the multiple second connecting rods 54 is provided with a third through hole. The multiple third through holes correspond to multiple third connecting holes 551 respectively. The length of the multiple folding ladders 5 after folding is less than the length of the inner cavity of the multiple bearing frames 4. Multiple third connecting bolts, the ends of which pass through the third connecting hole 551 and the third through hole in sequence, and the ends of the multiple third connecting bolts are respectively threaded with a third connecting nut.

[0033] In this embodiment, the support frame 4 is welded to the support frame 21 to ensure the stability of the support frame 4. The folding ladder 5 is rotated to the support frame 4 by connecting the base plate 55 and the second connecting rod 54, thereby ensuring the stability of the folding ladder 5. The length of the folded ladder 5 after folding is less than the length of the inner cavity of the support frame 4. The folded ladder 5 can be rotated through the second connecting rod 54 and the connecting seat plate 55, which makes it easy to rotate the folded ladder 5 to the upper surface of the support platform 2. The second connecting rod 54 and the connecting seat plate 55 are rotatably connected by the third connecting bolt and the third connecting nut. Loosening the third connecting nut facilitates rotation, while tightening the third connecting nut locks the second connecting rod 54 and the connecting seat plate 55 in place to ensure the stability of the folding ladder 5. This embodiment uses two support frames 4 as an example to realize the installation of two folding ladders 5, which facilitates the installation and debugging of related equipment by the staff.

[0034] like Figure 4 As shown, in an optional embodiment of the present invention, the plurality of folding ladders 5 include: The first ladder 51, the first end of the first ladder 51 is welded to the first end of the second connecting rod 54; The second ladder 52 has its first end rotatably connected to the second end of the first ladder 51.

[0035] In this embodiment, a folding ladder 5 is formed by the rotational connection of the first ladder 51 and the second ladder 52. The lengths of the first ladder 51 and the second ladder 52 are equal and the length of the inner cavity of the load-bearing frame 4 is equal. This makes the overall length of the first ladder 51 and the second ladder 52 after folding less than the length of the inner cavity of the load-bearing frame 4. This facilitates the rotation and folding of the folding ladder 5 from below the load-bearing platform 2 to the upper surface of the load-bearing platform 2, thereby enabling the folding ladder 5 to be retracted and preventing the folding ladder 5 from colliding with the erecting frame service platform during the process of the load-bearing platform 2 moving away from the rocket body.

[0036] like Figure 5 As shown, in an optional embodiment of the present invention, the plurality of folding ladders 5 further include: A first through groove 511 is provided at the second end of the first ladder 51. The first through groove 511 penetrates the outer side of the second end of the first ladder 51, and a first connecting hole 512 is provided through the inner wall of the first through groove 511. The second through groove 521 is provided at the first end of the second ladder 52. The second through groove 521 penetrates the outer side of the first end of the second ladder 52, and the inner wall of the second through groove 521 is provided with a second connecting hole 522. The first connecting rod 53 has a first end that extends into the first through groove 511 and has a first through hole that corresponds to the first connecting hole 512. The second end of the first connecting rod 53 extends into the second through groove 521 and has a second through hole that corresponds to the second connecting hole 522. The first connecting bolt has its end passing through the first connecting hole 512 and the first through hole, and the end of the first connecting bolt is threaded with a first connecting nut. The second connecting bolt has its end passing through the second connecting hole 522 and the second through hole, and the end of the second connecting bolt is threaded with a second connecting nut.

[0037] In this embodiment, the first end of the first connecting rod 53 is rotatably connected to the first through groove 511 through the first connecting hole 512, the first through hole, the first connecting bolt, and the first connecting nut; the second end of the first connecting rod 53 is rotatably connected to the second through groove 521 through the second connecting hole 522, the second through hole, the second connecting bolt, and the second connecting nut. This allows the first ladder 51 and the second ladder 52 to be folded into a parallel state, which facilitates the folded first ladder 51 and the second ladder 52 to be passed through the support frame 4 and rotated to the upper surface of the support platform 2. The first connecting rod 53 and the first ladder 51 are rotatably connected by the first connecting bolt and the first connecting nut. Loosening the first connecting nut facilitates rotation and folding, while tightening the first connecting nut fixes the first connecting rod 53 and the first ladder 51. The first connecting rod 53 and the second ladder 52 are rotatably connected by the second connecting bolt and the second connecting nut. Loosening the second connecting nut facilitates rotation and folding, while tightening the second connecting nut fixes the first connecting rod 53 and the second ladder 52.

[0038] The telescopic platform provided in the above embodiments of the present invention uses the moving part of the drive assembly 1 to move the carrying platform 2 closer to or away from the rocket body. When the carrying platform 2 is close to the rocket body, it facilitates the installation and debugging of related equipment in the primary liquid oxygen filling and draining pipeline of the rocket. When the carrying platform 2 is away from the rocket body, it maintains a safe distance from the rocket body during rocket takeoff, ensuring rocket takeoff safety. The two sets of drive assemblies 1 extend or retract the carrying platform 2 to ensure its stability. The hydraulic motor 15 drives the drive gear 16 to rotate. Since the drive gear 16 meshes with the rack 12 and the rack 12 is fixed, the meshing transmission between the drive gear 16 and the rack 12 causes the moving plate 14 to move. The moving plate 14 then drives the carrying platform 2 to extend or retract, thereby enabling the carrying platform 2 to move closer to or away from the rocket body. The follower plate 18 is connected to the connecting plate 22 to achieve multi-point support for the support frame 21. During the movement of the support frame 21... In the middle, the follower plate 18 slides with the fixed frame 11, further improving the stability of the bearing platform 2; the fence 3 is formed by multiple vertical rods 31 and multiple horizontal rods 32, ensuring the strength of the fence 3 while reducing its weight, making it easier for workers to dismantle and move the fence 3; the fence 3 is stable by connecting multiple vertical rods 31 with multiple plug-in sleeves and locking multiple vertical rods 31 with multiple fastening bolts, while also facilitating the disassembly and installation of the fence 3; the folding ladder 5 is formed by the rotational connection of the first ladder 51 and the second ladder 52. The lengths of the first ladder 51 and the second ladder 52 are equal and are equal to the length of the inner cavity of the bearing frame 4, so that the overall length of the first ladder 51 and the second ladder 52 after folding is less than the length of the inner cavity of the bearing frame 4. This makes it easy to rotate and fold the folding ladder 5 from below the bearing platform 2 to the upper surface of the bearing platform 2, realizing the retraction of the folding ladder 5 and avoiding the collision between the folding ladder 5 and the erecting frame service platform during the process of the bearing platform 2 moving away from the rocket body.

[0039] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A telescopic platform, characterized in that, include: The drive assembly (1) is fixed and connected to the erection frame service platform; The carrier platform (2) is connected to the moving part of the drive assembly (1) so as to move closer to or away from the rocket body under the drive of the drive assembly (1); The fence (3) is detachably connected to the support platform (2) and is located close to the rocket body; Multiple clearance openings (24) are provided through the surface of the bearing platform (2) and are close to the fence (3). Multiple foldable ladders (5) are rotatably arranged in multiple clearance openings (24). In the first state, the multiple foldable ladders (5) are vertically perpendicular to the underside of the support platform (2). In the second state, the multiple foldable ladders (5) are folded and rotated to the upper surface of the support platform (2).

2. The telescopic platform according to claim 1, characterized in that, The carrier platform (2) includes: The support frame (21) has multiple clearance openings (24) on its surface. Multiple steel mesh panels (23) are connected to the upper surface of the support frame (21) and the multiple steel mesh panels (23) avoid multiple clearance openings (24).

3. The telescopic platform according to claim 2, characterized in that, The drive assembly (1) is provided in two sets, and the moving parts of the two sets of drive assemblies (1) are respectively connected to multiple connecting plates (22) on both sides of the support frame (21).

4. The telescopic platform according to claim 3, characterized in that, The driving component (1) includes: A fixed frame (11) is connected to the erection platform; A rack (12) is connected to the fixing frame (11) and extends into the rocket body; A movable plate (14) is slidably connected to the fixed frame (11), and the movable plate (14) is connected to the connecting plate (22); A hydraulic motor (15) is connected to the movable plate (14). The output end of the hydraulic motor (15) is connected to a drive gear (16), which meshes with the rack (12).

5. The telescopic platform according to claim 4, characterized in that, The driving component (1) further includes: Follower plate (18), the follower plate (18) is slidably connected to the fixed frame (11), and the follower plate (18) is connected to the connecting plate (22); Driven gear (19) is rotatably connected to follower plate (18) and meshes with rack (12).

6. The telescopic platform according to claim 5, characterized in that, The driving component (1) further includes: Guide rail (13), the guide rail (13) is connected to the fixing frame (11), and there are two guide rails (13), which are located on both sides of the rack (12); Multiple sliders (17) are connected to the moving plate (14) and the follower plate (18) respectively, and the multiple sliders (17) are slidably connected to the two guide rails (13) respectively.

7. The telescopic platform according to claim 2, characterized in that, The fence (3) includes: Multiple vertical rods (31) are connected to multiple plug-in sleeves on the surface of the support frame (21). Multiple plug-in sleeves are threaded with fastening bolts on the outside. Multiple fastening bolts are in close contact with multiple vertical rods (31). Multiple horizontal bars (32) are welded and connected between two adjacent vertical bars (31).

8. The telescopic platform according to claim 2, characterized in that, Also includes: Multiple support frames (4) are welded to the support frame (21), and the multiple support frames (4) are respectively located in multiple clearance openings (24); Multiple connecting plates (55) are connected to the upper surface of multiple load-bearing frames (4), and a third connecting hole (551) is provided through the outer side of each of the multiple connecting plates (55). Multiple second connecting rods (54) are in an L-shaped structure. The first end of the multiple second connecting rods (54) is welded to the first end of the multiple folding ladders (5). The second end of the multiple second connecting rods (54) is provided with a third through hole. The multiple third through holes correspond to the multiple third connecting holes (551) respectively. The length of the multiple folding ladders (5) after folding is less than the length of the inner cavity of the multiple bearing frames (4). Multiple third connecting bolts, the ends of which pass through the third connecting hole (551) and the third through hole in sequence, and the ends of the multiple third connecting bolts are respectively threaded with a third connecting nut.

9. The telescopic platform according to claim 8, characterized in that, Multiple folding ladders (5) include: The first ladder (51) is welded to the first end of the second connecting rod (54); The second ladder (52) has its first end rotatably connected to the second end of the first ladder (51).

10. The telescopic platform according to claim 9, characterized in that, The multiple folding ladders (5) also include: The first through groove (511) is provided at the second end of the first ladder (51). The first through groove (511) penetrates the outer side of the second end of the first ladder (51). The inner wall of the first through groove (511) is provided with a first connecting hole (512). The second through groove (521) is provided at the first end of the second ladder (52), the second through groove (521) penetrates the outer side of the first end of the second ladder (52), and the inner wall of the second through groove (521) is provided with a second connecting hole (522). A first connecting rod (53) has its first end extending into the first through groove (511) and a first through hole provided through the first end of the first connecting rod (53), which corresponds to the first connecting hole (512); the second end of the first connecting rod (53) extends into the second through groove (521) and a second through hole provided through the second end of the first connecting rod (53), which corresponds to the second connecting hole (522); The first connecting bolt has its end passing through the first connecting hole (512) and the first through hole, and the end of the first connecting bolt is threaded with a first connecting nut; The second connecting bolt has its end passing through the second connecting hole (522) and the second through hole, and the end of the second connecting bolt is threaded with a second connecting nut.

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