A ring-shaped worktable

Abstract

The application belongs to the technical field of workbench, and particularly relates to a ring-shaped workbench which comprises four fan-shaped table bodies, the adjacent outer surfaces of the fan-shaped table bodies are connected through connecting mechanisms, the lower surfaces of the fan-shaped table bodies are uniformly provided with first adjusting mechanisms, the side surfaces of the fan-shaped table bodies close to the lower sides and towards the center of the circle are provided with anti-collision mechanisms, the middle positions of the side surfaces of the fan-shaped table bodies towards the center of the circle are provided with second adjusting mechanisms, and the side surfaces of the fan-shaped table bodies close to the upper sides and towards the center of the circle are fixedly provided with supporting mechanisms; the ring-shaped workbench is composed of four fan-shaped table bodies, is convenient to transport, has high bearing capacity, can meet the use of aircraft assemblies of various specifications, can make the platform in a non-suspended state, has good application prospect, a small ring-shaped workbench can be additionally arranged thereon, aircraft assemblies of the same rocket diameter and different heights can be met, and the installation and debugging of various aircraft assemblies are fast and efficient.

Description

Technical Field

[0001] This invention relates to the field of workbench technology, specifically a ring-shaped workbench. Background Technology

[0002] In the aerospace field, spacecraft assemblies mainly refer to two technical forms: one is the combined structure formed by the rendezvous and docking of spacecraft in space orbit, and the other is the integrated structure during the launch phase. Spacecraft assemblies need to be installed and tested before rocket launch.

[0003] Currently, the traditional approach is to set up a platform under the spacecraft assembly to facilitate work around it. However, the diameter of the newly developed rocket has increased, and the spacecraft assembly that matches it is larger than before. The existing platform can no longer meet the requirements. Considering that the spacecraft assembly has multiple states, it is necessary to design a new ring-shaped workbench that can meet various working conditions. Therefore, we propose a ring-shaped workbench to solve the above problems. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a ring-shaped worktable, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0008] A circular workbench includes four fan-shaped platforms. Adjacent outer surfaces of the fan-shaped platforms are connected by a connecting mechanism. First braked rollers are evenly distributed on the lower surface of each fan-shaped platform. First adjusting mechanisms are also evenly distributed on the lower surface of each fan-shaped platform. A fan-shaped patterned plate is fixedly installed on the upper surface of each fan-shaped platform. A protective mechanism is provided at the edge of the upper surface of each fan-shaped platform away from the center. An anti-collision mechanism is installed near the lower side of the side of each fan-shaped platform facing the center. A second adjusting mechanism is installed at the middle of the side of each fan-shaped platform facing the center. A support mechanism is fixedly installed near the upper side of the side of each fan-shaped platform facing the center. A movable platform is installed on the upper surface of the support mechanism. A working ladder is provided on the outer surface of the connecting points of the fan-shaped platforms.

[0009] Furthermore, the fan-shaped platform is made of aluminum profile, and the four fan-shaped platforms and the fan-shaped patterned plate on their upper surface constitute a ring-shaped worktable.

[0010] Furthermore, the connecting mechanism includes a connecting block and mounting holes. The connecting block is mounted on the outer surface of the fan-shaped platform, and the connecting block has mounting holes distributed in a rectangular pattern.

[0011] Furthermore, the first adjustment mechanism includes a threaded seat, a bolt rod, a handle, and a pad. The threaded seat is fixedly installed on the sector-shaped platform. The bolt rod is threaded into the threaded seat. The handle is fixedly installed on the upper surface of the bolt rod. The pad is fixedly installed on the lower surface of the bolt rod. The second adjustment mechanism has the same structure as the first adjustment mechanism.

[0012] Furthermore, the protective mechanism includes a connector and a guardrail body. The connector is uniformly fixedly installed circumferentially on the upper edge of the side of the fan-shaped platform away from the center. The guardrail body is installed between the upper surfaces of the connector.

[0013] Furthermore, the anti-collision mechanism includes a connecting seat, a first fastening wrench, a connecting rod, and a rubber wheel assembly. The connecting seat is fixedly installed at the center of the side of the fan-shaped platform facing the center. The connecting rod is installed on the connecting seat via the first fastening wrench, and the rubber wheel assembly is fixedly installed on the other end of the connecting rod.

[0014] Furthermore, the support mechanism includes a first hinge, an outer rod, an inner rod, a second fastening wrench, a second hinge, a support rod, a third hinge, and a support base. The first hinge is installed on the upper side of the fan-shaped platform facing the center. An outer rod is installed on the first hinge. An inner rod is inserted into the upper end of the outer rod. A second fastening wrench is threaded onto the corresponding side wall of the outer rod, and the second fastening wrench locks and fixes the outer rod and the inner rod. A support rod is installed on the upper end of the inner rod through the second hinge. The other end of the support rod is connected and fixed to the upper edge of the side of the fan-shaped platform near the center through the third hinge. Two support bases are fixedly installed on the side of the support rod, and the support bases are used for installing and fixing the movable platform.

[0015] Furthermore, the support base is locked and fixed to the support rod by a first fastening screw, and the support base is connected and fixed to the lower surface of the movable platform by a second fastening screw.

[0016] Furthermore, the working ladder includes a ladder body, a second braked roller, a third adjustment mechanism, and a handrail assembly. The lower surface of the ladder body is rectangularly arranged with the second braked roller and the third adjustment mechanism, and the upper surface of the ladder body is provided with handrail assemblies on both sides.

[0017] Furthermore, the third adjustment mechanism has the same structure as the first adjustment mechanism.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the present invention provides a ring-shaped worktable, which has the following beneficial effects:

[0020] This invention uses four sector-shaped platforms to form a ring-shaped workbench. Individual sector-shaped platforms are easy to transport, and the assembly of the sector-shaped platforms is quick and efficient, with good adaptability and strong load-bearing capacity. By disassembling and assembling the movable platform, it can meet the needs of various specifications of aircraft assemblies. The first and second adjustment mechanisms can keep the platform in a non-suspended state, which has good application prospects. A small ring-shaped workbench can be added to this ring-shaped workbench to meet the needs of aircraft assemblies with the same rocket diameter but different heights, making the installation and commissioning of various aircraft assemblies quick and efficient. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the workbench of the present invention;

[0022] Figure 2 This is a schematic diagram of the fan-shaped platform structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the connection mechanism structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the first adjustment mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the anti-collision mechanism of the present invention;

[0026] Figure 6 This is a schematic diagram of the support mechanism structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the mounting structure of the movable platform of the present invention from below;

[0028] Figure 8 This is a schematic diagram of the first installation state of the workbench of the present invention;

[0029] Figure 9 This is a schematic diagram of the movable platform storage structure of the present invention;

[0030] Figure 10 This is a schematic diagram of the second installation state of the workbench of the present invention.

[0031] In the diagram: 1. Fan-shaped platform; 2. Connecting mechanism; 201. Connecting block; 202. Mounting hole; 3. First braked roller; 4. First adjusting mechanism; 401. Threaded seat; 402. Bolt rod; 403. Handle; 404. Pad; 5. Fan-shaped patterned plate; 6. Protective mechanism; 601. Connecting piece; 602. Guardrail body; 7. Anti-collision mechanism; 701. Connecting seat; 702. First fastening wrench; 703. Connecting rod; 704. Rubber wheel assembly; 8. The first... 9. Adjustment mechanism; 901. Support mechanism; 902. First hinge; 903. Outer rod; 904. Inner rod; 905. Second fastening wrench; 906. Support rod; 907. Third hinge; 908. Support base; 10. Movable platform; 11. Working ladder; 111. Ladder body; 112. Second braked roller; 113. Third adjustment mechanism; 114. Handrail assembly; 12. First fastening screw; 13. Second fastening screw. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0033] like Figures 1-10 As shown, an embodiment of the present invention provides a ring-shaped worktable, including four fan-shaped platforms 1. The adjacent outer surfaces of the fan-shaped platforms 1 are connected by a connecting mechanism 2. The lower surface of the fan-shaped platforms 1 is evenly provided with first braked rollers 3 and a first adjusting mechanism 4. The upper surface of the fan-shaped platforms 1 is fixedly installed with a fan-shaped patterned plate 5. A protective mechanism 6 is provided at the edge of the upper surface of the fan-shaped platforms 1 away from the center. An anti-collision mechanism 7 is installed on the side of the fan-shaped platforms 1 facing the center near the lower side. A second adjusting mechanism 8 is installed at the middle of the side of the fan-shaped platforms 1 facing the center near the upper side. A support mechanism 9 is fixedly installed on the side of the fan-shaped platforms 1 facing the center near the upper side. A movable platform 10 is installed on the upper surface of the support mechanism 9. A work ladder 11 is provided on the outer surface of the connection of the fan-shaped platforms 1.

[0034] like Figure 1 As shown, in some embodiments, the fan-shaped platform 1 is made of aluminum profile, and the four fan-shaped platforms 1 and the fan-shaped patterned plate 5 on their upper surfaces constitute a ring-shaped worktable.

[0035] In this embodiment, the fan-shaped platform 1 is lightweight and easy to move, and can form a ring-shaped workbench fitted on the outside of the aircraft assembly.

[0036] like Figure 1 and Figure 3 As shown, in some embodiments, the connecting mechanism 2 includes a connecting block 201 and mounting holes 202. The connecting block 201 is mounted on the outer surface of the fan-shaped platform 1, and the connecting block 201 has mounting holes 202 distributed in a rectangular pattern.

[0037] In this embodiment, fastening bolts are installed in the mounting holes 202 on the connecting block 201, and the fastening bolts are installed on the adjacent sector-shaped platform 1 to achieve the effect of connecting and fixing the adjacent sector-shaped platform 1.

[0038] like Figure 1 and Figure 4 As shown, in some embodiments, the first adjustment mechanism 4 includes a threaded seat 401, a bolt rod 402, a handle 403, and a pad 404. The threaded seat 401 is fixedly installed on the fan-shaped platform 1. The bolt rod 402 is threaded onto the threaded seat 401. The handle 403 is fixedly installed on the upper surface of the bolt rod 402. The pad 404 is fixedly installed on the lower surface of the threaded seat 401. The second adjustment mechanism 8 has the same structure as the first adjustment mechanism 4.

[0039] In this embodiment, the handle 403 drives the bolt rod 402 to rotate within the threaded seat 401, causing the bolt rod 402 to move the pad 404 up and down. The lower surface of the pad 404 is lower than the lower surface of the first braked roller 3, which is used to support the fan-shaped platform 1, so that the fan-shaped platform 1 is placed horizontally and stably.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the protective mechanism 6 includes a connector 601 and a guardrail body 602. The connector 601 is uniformly fixedly installed circumferentially on the upper edge of the side of the fan-shaped platform 1 away from the center. The guardrail body 602 is installed between the upper surfaces of the connector 601.

[0041] In this embodiment, the connector 601 is used to install the guardrail body 602, which effectively prevents workers from accidentally falling off the fan-shaped patterned plate 5 and improves the protective function.

[0042] like Figure 1 and Figure 5As shown, in some embodiments, the anti-collision mechanism 7 includes a connecting seat 701, a first fastening wrench 702, a connecting rod 703, and a rubber wheel assembly 704. The connecting seat 701 is fixedly installed on the middle part of the side of the fan-shaped platform 1 facing the center. The connecting rod 703 is installed on the connecting seat 701 through the first fastening wrench 702. The rubber wheel assembly 704 is fixedly installed on the other end of the connecting rod 703.

[0043] In this embodiment, the connecting rod 703 rotates within the connecting seat 701, causing the rubber wheel assembly 704 at the end of the connecting rod 703 to face the center of the aircraft assembly. Then, the connecting seat 701 and the connecting rod 703 are locked and fixed by the first fastening wrench 702. The rubber wheel assembly 704 at the end of the connecting rod 703 prevents the annular worktable from making rigid contact with the aircraft assembly.

[0044] like Figure 1 , Figure 6 and Figure 7 As shown, in some embodiments, the support mechanism 9 includes a first hinge 901, an outer rod 902, an inner rod 903, a second tightening wrench 904, a second hinge 905, a support rod 906, a third hinge 907, and a support base 908. The first hinge 901 is mounted on the upper side of the side of the fan-shaped platform 1 facing the center. The outer rod 902 is mounted on the first hinge 901. The inner rod 903 is inserted into the upper end of the outer rod 902. The inner rod 903 corresponds to the outer rod 902. A second fastening wrench 904 is threaded onto the side wall, and the second fastening wrench 904 locks and fixes the outer rod 902 and the inner rod 903. A support rod 906 is installed on the upper end of the inner rod 903 through a second hinge 905. The other end of the support rod 906 is connected and fixed to the upper edge of the side of the fan-shaped platform 1 near the center through a third hinge 907. Two support seats 908 are fixedly installed on the side of the support rod 906, and the support seats 908 are used for installing and fixing the movable platform 10.

[0045] In this embodiment, the first hinge 901 and the third hinge 907 connect the outer rod 902 and the support rod 906 to the fan-shaped platform 1, respectively. The movable platform 10 is then supported by the support seat 908, achieving the effect of installing the movable platform 10. When the movable platform 10 is not needed, the second tightening wrench 904 is loosened, the inner rod 903 retracts into the outer rod 902, the support rod 906 is rotated clockwise to its limit position, and then the support device is tightened securely so that the support mechanism 9 does not contact the outer surface of the aircraft assembly.

[0046] like Figure 7As shown, in some embodiments, the support base 908 is locked and fixed to the support rod 906 by the first fastening screw 12, and the support base 908 is connected and fixed to the lower surface of the movable platform 10 by the second fastening screw 13.

[0047] In this embodiment, the first fastening screw 12 connects and fixes the support base 908 and the support rod 906, and the second fastening screw 13 connects and fixes the support base 908 and the movable platform 10.

[0048] like Figure 10 As shown, in some embodiments, the working ladder 11 includes a ladder body 111, a second braked roller 112, a third adjustment mechanism 113, and a handrail assembly 114. The lower surface of the ladder body 111 is provided with the second braked roller 112 and the third adjustment mechanism 113 in a rectangular arrangement at the four corners. The upper surface of the ladder body 111 is provided with handrail assemblies 114 on both sides of the edge.

[0049] In this embodiment, the ladder body 111 moves to the connection between adjacent fan-shaped platforms 1 via the second braked roller 112, causing the second braked roller 112 to brake and the third adjustment mechanism 113 to be supported on the ground. The handrail assembly 114 is used to support workers when they go up and down the ladder body 111, making it convenient for workers to go up and down the circular work platform.

[0050] like Figure 10 As shown, in some embodiments, the third adjustment mechanism 113 has the same structure as the first adjustment mechanism 4.

[0051] In this embodiment, the third adjustment mechanism 113 can support the ladder body 111, making the ladder body 111 stable and secure.

[0052] In use, the annular workbench and the aircraft assembly are installed in the first configuration. The connecting rod 703 of the anti-collision mechanism 7 of the fan-shaped platform 1 is rotated within the connecting seat 701, causing the rubber wheel assembly 704 at the end of the connecting rod 703 to face the center of the aircraft assembly. The connecting seat 701 and the connecting rod 703 are then locked together using the first tightening wrench 702. The four fan-shaped platforms 1 are then moved one by one towards the aircraft support platform via the first braked roller 3 to prevent rigid collisions. The first braked roller 3 is locked, causing the handle 403 in the first adjusting mechanism 4 to rotate the bolt rod 402 within the threaded seat 401. This causes the bolt rod 402 to move the pad 404 up and down. The lower surface of the pad 404 is lower than the lower surface of the first braked roller 3, providing support for the fan-shaped platforms 1. The four fan-shaped platforms 1 are then connected together via the connecting mechanism 2 to prevent tipping due to personnel working on them. The first hinge 901 and the third hinge 907 in the support mechanism 9 are connected to the outer rod 902 and the support rod 906 to the fan-shaped platform 1, respectively. The movable platform 10 is then supported by the support seat 908 to achieve the effect of installing the movable platform 10. The inner rod 903 and the outer rod 902 are leveled by tightening the wrench to make the installation distance 400mm, and the support seat 908 is securely connected. The movable platform 10 is placed on the support seat 908 and tightened with the second fastening screw 13. The ladder body 111 is moved to the connection between the adjacent fan-shaped platform 1 by the second braked roller 112, so that the second braked roller 112 is braked and the third adjustment mechanism 113 is supported on the ground. The handrail assembly 114 is used to support the workers when they go up and down the ladder body 111, so that the workers can go up and down the circular work platform and ensure that the work ladder 11 is not suspended.

[0053] The annular workbench and the aircraft assembly are installed in a second configuration. The connecting rod 703 in the anti-collision mechanism 7 of the fan-shaped platform 1 is rotated within the connecting seat 701, so that the rubber wheel assembly 704 at the end of the connecting rod 703 faces the center of the aircraft assembly. The movable platform 10 is disassembled and placed on the lower inner wall of the fan-shaped platform 1. The second fastening wrench 904 in the support mechanism 9 is loosened, and the inner rod 903 retracts into the outer rod 902. The support rod 906 is rotated clockwise to its limit position. Then, the support device is securely tightened, ensuring that the support mechanism 9 does not... The connecting seat 701 and the connecting rod 703 are locked together by the first tightening wrench 702 after contacting the outer surface of the aircraft assembly. The four sector-shaped platforms 1 are then moved one by one towards the aircraft support platform by the first braked roller 3 to avoid rigid collisions. The first braked roller 3 is locked, causing the handle 403 in the first adjusting mechanism 4 to drive the bolt rod 402 to rotate within the threaded seat 401. This causes the bolt rod 402 to move the pad 404 up and down. The lower surface of the pad 404 is lower than the lower surface of the first braked roller 3, which is used to support the sector-shaped platforms 1. The four sector-shaped platforms 1 are connected by a connecting mechanism 2 to form a whole, preventing tipping due to personnel working on it. The ladder body 111 is moved to the connection point between adjacent sector-shaped platforms 1 by a second braked roller 112, which brakes the second braked roller 112 and supports the third adjustment mechanism 113 on the ground. The handrail assembly 114 is used to support workers when climbing up and down the ladder body 111, making it convenient for workers to go up and down the circular work platform and ensuring that the work ladder 11 is not suspended. The four sector-shaped platforms 1 form a circular work platform. Individual sector-shaped platforms 1 are easy to transport, and the assembly between sector-shaped platforms 1 is quick and efficient, with good adaptability and strong load-bearing capacity. By disassembling and assembling the movable platform 10, it can meet the needs of various specifications of aircraft assemblies. The first adjustment mechanism 4 and the second adjustment mechanism 8 can keep the platform in a non-suspended state, which has good application prospects. A small circular work platform can be added to this circular work platform to meet the needs of aircraft assemblies with the same rocket diameter but different heights, making the installation and commissioning of various aircraft assemblies quick and efficient.

[0054] In summary, this annular workbench, composed of four fan-shaped platforms 1, is convenient for transportation, quick and efficient for assembly, adaptable, and has a strong load-bearing capacity. It can meet the needs of various specifications of aircraft assemblies and can keep the platform in a non-suspended state, showing good application prospects. A small annular workbench can be added on top to accommodate aircraft assemblies with the same rocket diameter but different heights, making the installation and commissioning of various aircraft assemblies quick and efficient.

[0055] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ring-shaped worktable, comprising a fan-shaped platform (1), characterized in that: Four fan-shaped platforms (1) are provided. The adjacent outer surfaces of the fan-shaped platforms (1) are connected by a connecting mechanism (2). The lower surface of the fan-shaped platform (1) is evenly provided with first braked rollers (3). The lower surface of the fan-shaped platform (1) is evenly provided with first adjusting mechanisms (4). The upper surface of the fan-shaped platform (1) is fixedly installed with a fan-shaped pattern plate (5). The upper surface of the fan-shaped platform (1) is provided with a protective mechanism (6) at the edge away from the center. The side of the fan-shaped platform (1) facing the center is provided with an anti-collision mechanism (7) near the lower side. The side of the fan-shaped platform (1) facing the center is provided with a second adjusting mechanism (8). The side of the fan-shaped platform (1) facing the center is fixedly installed with a support mechanism (9) near the upper side. The upper surface of the support mechanism (9) is provided with a movable platform (10). The outer surface of the connection of the fan-shaped platform (1) is provided with a working ladder (11). The anti-collision mechanism (7) includes a connecting seat (701), a first fastening wrench (702), a connecting rod (703), and a rubber wheel assembly (704). The connecting seat (701) is fixedly installed on the middle part of the side of the fan-shaped platform (1) facing the center. The connecting rod (703) is installed on the connecting seat (701) through the first fastening wrench (702). The rubber wheel assembly (704) is fixedly installed on the other end of the connecting rod (703). The support mechanism (9) includes a first hinge (901), an outer rod (902), an inner rod (903), a second tightening wrench (904), a second hinge (905), a support rod (906), a third hinge (907), and a support base (908). The first hinge (901) is installed on the upper side of the fan-shaped platform (1) facing the center. An outer rod (902) is installed on the first hinge (901). An inner rod (903) is inserted into the upper end of the outer rod (902). The inner rod (903) is located on the side wall of the outer rod (902) corresponding to the inner rod (903). A second fastening wrench (904) is installed on the upper thread, and the second fastening wrench (904) locks and fixes the outer rod (902) and the inner rod (903). A support rod (906) is installed on the upper end of the inner rod (903) through a second hinge (905). The other end of the support rod (906) is connected and fixed to the upper edge of the side of the fan-shaped platform (1) near the center through a third hinge (907). Two support seats (908) are fixedly installed on the side of the support rod (906), and the support seats (908) are used to install and fix the movable platform (10).

2. The annular worktable according to claim 1, characterized in that: The fan-shaped platform (1) is made of aluminum profile, and the four fan-shaped platforms (1) and the fan-shaped patterned plate (5) on their upper surface constitute a ring-shaped worktable.

3. A ring-shaped worktable according to claim 1, characterized in that: The connecting mechanism (2) includes a connecting block (201) and mounting holes (202). The connecting block (201) is mounted on the outer surface of the fan-shaped platform (1), and the connecting block (201) has mounting holes (202) arranged in a rectangular pattern.

4. A ring-shaped worktable according to claim 1, characterized in that: The first adjustment mechanism (4) includes a threaded seat (401), a bolt rod (402), a handle (403), and a pad (404). The threaded seat (401) is fixedly installed on the fan-shaped platform (1). The bolt rod (402) is installed in the threaded seat (401). The handle (403) is fixedly installed on the upper surface of the bolt rod (402). The pad (404) is fixedly installed on the lower surface of the bolt rod (402). The second adjustment mechanism (8) has the same structure as the first adjustment mechanism (4).

5. A ring-shaped worktable according to claim 1, characterized in that: The protective mechanism (6) includes a connector (601) and a guardrail body (602). The connector (601) is uniformly fixed in the circumferential direction at the upper edge of the side of the fan-shaped platform (1) away from the center. The guardrail body (602) is installed between the upper surfaces of the connector (601).

6. A ring-shaped worktable according to claim 1, characterized in that: The support base (908) is locked and fixed to the support rod (906) by the first fastening screw (12), and the support base (908) is connected and fixed to the lower surface of the movable platform (10) by the second fastening screw (13).

7. A ring-shaped worktable according to claim 1, characterized in that: The working ladder (11) includes a ladder body (111), a second braked roller (112), a third adjustment mechanism (113), and a handrail assembly (114). The lower surface of the ladder body (111) is provided with a rectangular arrangement of the second braked roller (112) and the third adjustment mechanism (113). The upper surface of the ladder body (111) is provided with handrail assemblies (114) on both sides.

8. A ring-shaped worktable according to claim 7, characterized in that: The third adjustment mechanism (113) has the same structure as the first adjustment mechanism (4).

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