A maintenance platform for the interior of a steel chimney

Abstract

This invention discloses a maintenance platform for the interior of a steel chimney, belonging to the field of steel chimney maintenance. It includes a tiered lifting component, which comprises a base plate, a first lifting element, a tiering plate, a second lifting element, and a maintenance platform. The first lifting element is located on top of the base plate, the tiering plate is fixedly installed on top of the first lifting element, the second lifting element is located on top of the tiering plate, and the maintenance platform is fixedly installed on top of the second lifting element. The maintenance platform has internal reinforcing components, including a storage chamber within the platform. The storage chamber has a first locking plate and a second locking plate movably installed at its front and rear ends, respectively. Through the design of the base plate, maintenance platform, handrail, first locking plate, and second locking plate, good safety can be achieved during high-altitude operations, ensuring the personal safety of maintenance personnel.

Description

Technical Field

[0001] This invention relates to the field of steel structure chimney maintenance, and more specifically, to a maintenance platform for the interior of a steel structure chimney. Background Technology

[0002] Steel chimneys are used in civil high-rise buildings. They are made of materials such as stainless steel, titanium steel composite plates, and carbon steel, and have the characteristics of heat preservation, effective durability, and safety and reliability. Nowadays, steel structure chimneys are generally produced as a modular structure, composed of multiple chimney sections, which facilitates transportation. During installation, they are assembled using the flange integral welding method.

[0003] Steel chimneys require both internal and external maintenance when put into use and after prolonged use. When performing internal maintenance on steel chimneys, a lifting maintenance platform is used to facilitate the maintenance work inside the chimney. However, steel chimneys are usually tens or hundreds of meters high, and existing conventional maintenance platforms are difficult to meet the needs of internal maintenance work. Even if existing maintenance platforms can be raised to a sufficient height, their stability will be reduced at such heights, thereby reducing the personal safety of maintenance personnel.

[0004] Therefore, a maintenance platform for the interior of a steel chimney is specifically proposed. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a maintenance platform for the inside of a steel structure chimney, which can achieve good safety during high-altitude operations and ensure the personal safety of maintenance personnel.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A maintenance platform for the interior of a steel chimney includes a graded lifting component. The graded lifting component consists of a base plate, a first lifting element, a graded plate, a second lifting element, and a maintenance platform. The first lifting element is disposed on the top of the base plate, the graded plate is fixedly installed on the top of the first lifting element, the second lifting element is disposed on the top of the graded plate, and the maintenance platform is fixedly installed on the top of the second lifting element.

[0008] The maintenance platform has internal reinforcing components, including a storage chamber inside the maintenance platform. A first snap-fit ​​plate and a second snap-fit ​​plate are movably installed at the front and rear ends of the storage chamber, respectively. Slots are provided on the left and right sides of the first and second snap-fit ​​plates at the front and rear ends of the storage chamber, with two sets of slots arranged from front to back. A spring is fixedly installed between the first and second snap-fit ​​plates. A movable plate is fixedly installed on the top side of both the first and second snap-fit ​​plates that are close to each other. A second slide rail groove is provided on the top of the maintenance platform, and the movable plate is located within the second slide rail groove.

[0009] Furthermore, a handrail is provided on the top of the inspection platform, and a support rod is fixedly installed at the bottom of the handrail. The handrail is movably installed above the inspection platform via the support rod. A first slide rail groove is provided at the top edge of the inspection platform, and the bottom of the support rod is inserted into the first slide rail groove.

[0010] Furthermore, both the second slide rail groove and the first slide rail groove are connected to the storage compartment inside the maintenance platform.

[0011] Furthermore, when the first and second snap-fit ​​plates are located inside the storage chamber, the support rod is engaged in the slots of the first and second snap-fit ​​plates away from the center of the storage chamber; when the first and second snap-fit ​​plates extend out of the storage chamber, the support rod is engaged in the slots of the first and second snap-fit ​​plates near the center of the storage chamber.

[0012] Furthermore, a protective net component is provided inside the side of the inspection platform. The protective net component includes a storage groove formed inside the side of the inspection platform. One side of the storage groove communicates with a storage chamber. A first bearing is movably installed on the side of the storage groove that does not communicate with the storage chamber. A second bearing is movably installed on the side of the first snap-fit ​​plate near the storage groove. An extension arm is movably connected between the first bearing and the second bearing. A protective net is provided on the inner side of the extension arm.

[0013] Furthermore, the extension arm is arc-shaped and can extend to both sides. When the first snap-fit ​​plate is located inside the storage chamber, the extension arm is located inside the storage slot.

[0014] Furthermore, a platform opening is provided on the right side of the base plate, and wheels are fixedly installed on the bottom of the base plate. The first lifting component includes a first fixed plate and a second fixed plate fixedly installed at the front and rear ends of the top of the base plate. A movable groove is provided on the top of the first fixed plate, and a threaded rod is movably installed inside the movable groove. A motor is fixedly installed on the right side of the base plate, and the output end of the motor is fixedly connected to the threaded rod. A first mounting seat is fixedly installed on the top left side of the first fixed plate, and a second mounting seat is movably installed inside the movable groove. The second mounting seat is penetrated by the threaded rod, and a scissor-type connecting rod is movably installed on the top of both the first and second mounting seats.

[0015] Furthermore, the difference between the second fixing plate and the first fixing plate is that the second fixing plate does not have a drive assembly consisting of a threaded rod and a motor inside.

[0016] Furthermore, the grading plate is movably mounted above the base plate via the first lifting component. The front and rear ends of the bottom of the grading plate are respectively fixedly mounted with a set of scissor-type connecting rods. The structure of the second lifting component is the same as that of the first lifting component. The second lifting component is fixedly mounted on the top of the second lifting component via the first fixing plate and the second fixing plate. The bottom of the inspection platform is fixedly mounted with the two sets of scissor-type connecting rods of the second lifting component. The grading plate and the second lifting component are a set of lifting components, and the number can be set according to the actual application.

[0017] Furthermore, the hinge joints of the scissor-type connecting rods installed on the top of the first fixed plate and the scissor-type connecting rods installed on the top of the second fixed plate are both fixedly connected to connecting rods. The diameter of the inspection platform is smaller than the diameter of the grading plate, the diameter of the grading plate is smaller than the diameter of the base plate, and the diameter of the platform above the base plate gradually decreases.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] (1) This solution, through the design of the base plate, maintenance platform, handrail, first clamping plate, second clamping plate and other structures, can achieve good safety during high-altitude operations and ensure the personal safety of maintenance personnel.

[0020] (2) This solution greatly increases the area of ​​the maintenance platform by combining the structure of the extension arm, protective net and first snap plate, thereby greatly reducing the risk of maintenance personnel falling from the maintenance platform and further improving the safety of the device during use.

[0021] (3) This scheme improves the stability of the device during use through a hierarchical design, avoiding the problem that stability will be affected when relying on only one set of lifting components to lift too high, thereby ensuring the safety of maintenance personnel during the work process.

[0022] (4) This solution ensures the stability of the lifting component during operation through the design of the first fixed plate, threaded rod, scissor linkage, second fixed plate, and connecting rod. At the same time, it can save the use of power equipment and reduce the production cost of the device. The stability of the lifting component is improved, which in turn improves the overall safety of the device during use. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the maintenance platform of the present invention when it is not raised.

[0024] Figure 2 This is a schematic diagram of the maintenance platform lifting structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the inspection platform of the present invention.

[0026] Figure 4 For the present invention Figure 3 Enlarged structural diagram of section A in the middle;

[0027] Figure 5 For the present invention Figure 3 Enlarged structural diagram of section B in the middle;

[0028] Figure 6 This is a schematic diagram of the first lifting component of the present invention;

[0029] Figure 7 For the present invention Figure 6 Enlarged structural diagram of the details at point C.

[0030] Explanation of the labels in the diagram:

[0031] 1. Tiered lifting component; 11. Base plate; 12. Platform opening; 13. Wheel; 14. First lifting component; 141. First fixed plate; 142. Moving slot; 143. Threaded rod; 144. Motor; 145. First mounting base; 146. Second mounting base; 147. Scissor linkage; 148. Second fixed plate; 149. Linkage rod; 15. Tiered plate; 16. Second lifting component; 17. Inspection platform; 2. Reinforcing component; 21. Handrail; 22. Support rod; 23. First slide rail slot; 24. Storage chamber; 25. First snap-fit ​​plate; 26. Snap-fit ​​slot; 27. Second snap-fit ​​plate; 28. Spring; 29. ​​Moving plate; 210. Second slide rail slot; 3. Protective net component; 31. Storage slot; 32. First bearing; 33. Second bearing; 34. Extending arm; 35. Protective net. Detailed Implementation

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

[0033] Please see Figures 1 to 3 A maintenance platform for the interior of a steel chimney includes a tiered lifting component 1. The tiered lifting component 1 comprises a base plate 11, a first lifting element 14, a tiering plate 15, a second lifting element 16, and a maintenance platform 17. The first lifting element 14 is disposed on top of the base plate 11, the tiering plate 15 is fixedly installed on top of the first lifting element 14, the second lifting element 16 is disposed on top of the tiering plate 15, and the maintenance platform 17 is fixedly installed on top of the second lifting element 16. A reinforcing component 2 is provided inside the maintenance platform 17, the reinforcing component 2 including a receiving element formed inside the maintenance platform 17. The storage chamber 24 has a first snap-fit ​​plate 25 and a second snap-fit ​​plate 27 movably installed at its front and rear ends, respectively. The first snap-fit ​​plate 25 and the second snap-fit ​​plate 27 at the front and rear ends of the storage chamber 24 have slots 26 on their left and right sides, and there are two sets of slots 26 from front to back. A spring 28 is fixedly installed between the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27. A movable plate 29 is fixedly installed on the side of the top of the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27 that are close to each other. The top of the maintenance platform 17 has a second slide rail groove 210, and the movable plate 29 is located in the second slide rail groove 210.

[0034] The maintenance platform 17 has a handrail 21 on its top and a support rod 22 fixedly installed at the bottom of the handrail 21. The handrail 21 is movably installed above the maintenance platform 17 via the support rod 22. A first slide rail groove 23 is provided at the top edge of the maintenance platform 17. The bottom of the support rod 22 is inserted into the first slide rail groove 23. Both the second slide rail groove 210 and the first slide rail groove 23 communicate with the storage chamber 24 inside the maintenance platform 17. When the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27 are inside the storage chamber 24, the support rod 22 is engaged in the slot 26 of the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27 away from the center of the storage chamber 24. When the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27 extend out of the storage chamber 24, the support rod 22 is engaged in the slot 26 of the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27 near the center of the storage chamber 24.

[0035] By adopting the above technical solution, both the grading plate 15 and the maintenance platform 17 are in an unraised state at the beginning of use. At this time, the device is moved into the interior of the steel structure chimney by the wheels 13 at the bottom of the base plate 11. Maintenance personnel then climb up to the top of the maintenance platform 17 through the access 12 on the right side of the base plate 11 and the grading plate 15. When climbing up, the maintenance personnel need to lock the first lifting component 14. When the maintenance personnel are above the maintenance platform 17, the first lifting component 14 and the second lifting component 16 are raised to lift the maintenance personnel. After reaching the predetermined height, the operation of the first lifting component 14 and the second lifting component 16 is stopped. Before the maintenance work begins, the maintenance personnel can rotate the handrail 21. When the handrail 21 is rotated, the support rod 22 at its bottom moves accordingly. The first slide rail 23 moves within the first slide rail groove 23. At this time, the support rod 22 moves out from the slot 26 near the outer side of the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27, releasing the restriction on the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27. The first snap-fit ​​plate 25 and the second snap-fit ​​plate 27 extend out of the storage chamber 24 with the help of the spring 28. After the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27 are completely extended out of the storage chamber 24, the handrail 21 is rotated in the opposite direction, so that the support rod 22 at the bottom of the handrail 21 is reset and snapped into the slot 26 near the center point of the storage chamber 24 on the side of the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27, limiting the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27. After the first snap-fit ​​plate 25 and the second snap-fit ​​plate 27 are unfolded, their front and rear ends can contact the inner wall of the steel structure chimney.

[0036] Steel chimneys are typically welded together using flanges, resulting in protrusions at the chimney section joints. Ideally, the first locking plate 25 and the second locking plate 27 should be positioned above these protrusions when unfolded. After unfolding, the moving plate 29 moves the first locking plate 25 to the outermost edge of the second slide rail groove 210. To retract the first locking plate 25, first rotate the handle 21 to release the restriction on the first locking plate 25 via the support rod 22, then retract the first locking plate 25 via the moving plate 29. After retraction, rotate the support rod 22 to confine the first locking plate 25 within the storage chamber 24. At this point, the spring 28 is compressed. For the next use... After the restrictions on the first locking plate 25 and the second locking plate 27 are lifted, they can be ejected from the storage chamber 24 by the spring 28. Through the above structural design, the safety of the device during use is further improved, ensuring the personal safety of maintenance personnel. During operation, the first locking plate 25 and the second locking plate 27 unfold and contact the inner wall of the steel structure chimney, and are located above the splicing protrusion of the steel structure chimney section. Even if the device lifting component fails to provide support during the maintenance personnel's work, the maintenance platform 17 can be locked inside the chimney with the help of the first locking plate 25 and the second locking plate 27, and will not fall directly.

[0037] like Figures 2 to 5As shown, a protective net component 3 is provided inside the side of the inspection platform 17. The protective net component 3 includes a storage groove 31 opened inside the side of the inspection platform 17. One side of the storage groove 31 is connected to the storage chamber 24. A first bearing 32 is movably installed on the side of the storage groove 31 that is not connected to the storage chamber 24. A second bearing 33 is movably installed on the side of the first snap-fit ​​plate 25 near the storage groove 31. An extension arm 34 is movably connected between the first bearing 32 and the second bearing 33. A protective net 35 is provided on the inner side of the extension arm 34. The extension arm 34 is arc-shaped and can extend to both sides. When the first snap-fit ​​plate 25 is located inside the storage chamber 24, the extension arm 34 is located inside the storage groove 31.

[0038] By adopting the above technical solution, a protective net component 3 is also provided inside the side of the maintenance platform 17. Before starting work, the maintenance personnel unfold the first latching plate 25 in the storage chamber 24 and limit its position by the support rod 22. When the first latching plate 25 extends out of the storage chamber 24, the first latching plate 25 drives the extension arm 34 to extend out of the storage slot 31 through the second bearing 33 installed on the side. When the first latching plate 25 extends to its farthest point, the extension arm 34 is opened to its maximum extent. During the opening process, the other end of the extension arm 34 rotates through the first bearing 32. After the extension arm 34 is unfolded, the protective net 35 installed on the inner side of the extension arm 34 is also unfolded. At this time, the front and rear sides of the maintenance platform 17 are both unfolded with extension arms 34 and protective nets. The protective net component 3, composed of 35 and other components, can largely catch any workpieces that fall while maintenance personnel are working above the maintenance platform 17, preventing them from falling and reducing the possibility of accidents. Furthermore, when unfolded, the protective net component 3, together with the first snap-fit ​​plate 25, significantly increases the area of ​​the maintenance platform 17. Even if maintenance personnel slip and fall on the maintenance platform 17, it is difficult for them to fall off. Through the above structural design, the safety of this device during use is further improved. The combination of the extended arm 34, protective net 35, and first snap-fit ​​plate 25 greatly increases the area of ​​the maintenance platform 17, thereby significantly reducing the possibility of maintenance personnel falling from the maintenance platform 17.

[0039] like Figures 1 to 7As shown, a platform opening 12 is provided on the right side of the base plate 11, and wheels 13 are fixedly installed on the bottom of the base plate 11. The first lifting component 14 includes a first fixing plate 141 and a second fixing plate 148 fixedly installed on the front and rear ends of the top of the base plate 11. A moving groove 142 is provided on the top of the first fixing plate 141, and a threaded rod 143 is movably installed inside the moving groove 142. A motor 144 is fixedly installed on the right side of the base plate 11, and the output end of the motor 144 is fixedly connected to the threaded rod 143. A first mounting seat 145 is fixedly installed on the top left side of the first fixing plate 141. A second mounting seat 146 is movably installed inside the moving groove 142, and the threaded rod 143 penetrates the second mounting seat 146. A scissor-type connecting rod 147 is movably installed on the top of the first mounting seat 145 and the second mounting seat 146. The difference between the second fixing plate 148 and the first fixing plate 141 is that the second fixing plate 148 does not have a drive assembly consisting of the threaded rod 143 and the motor 144 inside.

[0040] By adopting the above technical solution, the graded lifting component 1 consists of a base plate 11, a first lifting member 14, a graded plate 15, and a second lifting member 16. The structure of the first lifting member 14 is the same as that of the second lifting member 16. When lifting the maintenance platform 17, the motor 144 is started. The output end of the motor 144 drives the threaded rod 143 to rotate. When the threaded rod 143 rotates, it drives the second mounting seat 146 inside the moving groove 142 to move. When the second mounting seat 146 gets closer and closer to the first mounting seat 145, the gap of the hinge of the scissor-type connecting rod 147 will become narrower. At this time, the graded plate 15 will be lifted by the scissor-type connecting rod 147. Conversely, when the gap of the hinge of the scissor-type connecting rod 147 becomes wider, the graded plate 15 will descend. The second lifting member 16 above the graded plate 15... The working principle of 6 is the same as that of the first lifting component 14. It should be noted that the first lifting component 14 and the second lifting component 16 lift sequentially from top to bottom, rather than simultaneously, to ensure the safety of the device during operation. The grading plate 15 and the second lifting component 16 are first-level lifting components, and the number of grading plates 15 and the second lifting component 16 installed can be determined according to the actual usage requirements of the device. Through the grading design, the stability of the device after lifting can be improved. When lifting is only performed by a set of first lifting components 14, the stability of the maintenance platform 17 will be affected after it reaches the top. However, this device can avoid such problems through the grading design, improve the stability of the device during use, and ensure the safety of maintenance personnel during work.

[0041] like Figures 1 to 7As shown, the grading plate 15 is movably mounted above the base plate 11 via the first lifting member 14. The front and rear ends of the bottom of the grading plate 15 are respectively fixedly mounted with a set of scissor-type connecting rods 147. The structure of the second lifting member 16 is the same as that of the first lifting member 14. The second lifting member 16 is fixedly mounted on the top of the second lifting member 16 via the first fixing plate 141 and the second fixing plate 148. The bottom of the maintenance platform 17 is fixedly mounted with the two sets of scissor-type connecting rods 147 of the second lifting member 16. The grading plate 15 and the second lifting member 16 are a set of lifting components, and the number can be set according to actual application. The hinge joints of the scissor-type connecting rods 147 mounted on the top of the first fixing plate 141 and the scissor-type connecting rods 147 mounted on the top of the second fixing plate 148 are all fixedly connected with connecting rods 149. The diameter of the maintenance platform 17 is smaller than the diameter of the grading plate 15, the diameter of the grading plate 15 is smaller than the diameter of the base plate 11, and the diameter of the platform above the base plate 11 gradually decreases.

[0042] By adopting the above technical solution, connecting rods 149 are installed at the hinge joints of the scissor-type connecting rod 147 installed above the first fixed plate 141 and the scissor-type connecting rod 147 installed above the second fixed plate 148. Connecting rods 149 are also installed between the first mounting base 145 and the second mounting base 146 on the top of the first fixed plate 141 and the first mounting base 145 and the second mounting base 146 on the top of the second fixed plate 148. After the motor 144 starts, its output end drives the threaded rod 143 to rotate. When the threaded rod 143 rotates, it causes the second mounting base 146 to shift. During the shift, the second mounting base 146 is moved by the connecting rods 149. The second mounting base 146 above the second fixed plate 148 rotates, so the scissor-type connecting rod 147 installed on the top of the second fixed plate 148 will move simultaneously with the scissor-type connecting rod 147 installed above the first fixed plate 141. All hinge points of the two sets of scissor-type connecting rods 147 are also equipped with connecting rods 149. Therefore, the two sets of scissor-type connecting rods 147 can always maintain synchronous movement during the lifting process, which greatly ensures the stability of the first lifting component 14 during operation. At the same time, it can also save the use of power equipment and reduce the production cost of the device. The improved stability of the first lifting component 14 also improves the overall safety of the device during use.

[0043] Instructions for use: When in use, move this device into the steel chimney via the wheels 13 at the bottom of the base plate 11, then lock the wheels 13. Maintenance personnel can then climb up to the maintenance platform 17 via the access ramp 12. Next, control the first lifting component 14 and the second lifting component 16 to lift the maintenance platform 17. The first lifting component 14 and the second lifting component 16 move sequentially from bottom to top. When the first lifting component 14 rises, the motor 144 is activated, driving the threaded rod 143 to rotate. The threaded rod 143 then drives the second lifting component... The seat 146 moves, causing the scissor linkage 147 to rise. When the scissor linkage 147 on the top of the first fixed plate 141 rises, it synchronously drives the scissor linkage 147 on the top of the second fixed plate 148 to rise via the connecting rod 149. The second lifting component 16 works on the same principle as the first lifting component 14. After the maintenance platform 17 is lifted, before the maintenance personnel start working, they first rotate the handrail 21. When the handrail 21 rotates, it drives the support rod 22 to move in the first slide rail groove 23, causing the support rod 22 to move out of the slot 26 and release the first locking plate 25. The first and second clamping plates 25 and 27 extend from the storage chamber 24 due to the restriction of the second clamping plate 27. After extending, the first and second clamping plates 25 and 27 are clamped onto the protruding positions at the joints of the steel chimney. Simultaneously, the extension arm 34 extends from the storage slot 31, driven by the extension of the first clamping plate 25. The protective net 35 is deployed after the extension arm 34 extends with the help of the first clamping plate 25. After the work is completed, maintenance personnel must first retract the first and second clamping plates 25 and 27 back into the storage chamber 24. The first locking plate 25 and the second locking plate 27 are moved by the moving plate 29, and then the handrail 21 is rotated in the opposite direction. The first locking plate 25 and the second locking plate 27 are restricted again by the support rod 22 and the slot 26. The gap of the second slide rail slot 210 opened on the top of the maintenance platform 17 is small and will not affect the normal walking of maintenance personnel on the surface of the maintenance platform 17. When the first locking plate 25 is retracted, the extension arm 34 is also retracted at the same time. Finally, the control device is lowered. When the device is lowered, the operation sequence of the first lifting component 14 and the second lifting component 16 is reversed.

[0044] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A maintenance platform for the interior of a steel chimney, comprising a graded lifting component (1), characterized in that: The graded lifting component (1) consists of a base plate (11), a first lifting component (14), a graded plate (15), a second lifting component (16), and a maintenance platform (17). The first lifting component (14) is located on the top of the base plate (11), the graded plate (15) is fixedly installed on the top of the first lifting component (14), the second lifting component (16) is located on the top of the graded plate (15), and the maintenance platform (17) is fixedly installed on the top of the second lifting component (16). The maintenance platform (17) is provided with a reinforcing component (2) inside. The reinforcing component (2) includes a storage chamber (24) opened inside the maintenance platform (17). The front and rear ends of the storage chamber (24) are respectively movably installed with a first snap-fit ​​plate (25) and a second snap-fit ​​plate (27). The first snap-fit ​​plate (25) and the second snap-fit ​​plate (27) at the front and rear ends of the storage chamber (24) are respectively provided with slots (26). The slots (26) are provided in two sets from front to back. A spring (28) is fixedly installed between the first snap-fit ​​plate (25) and the second snap-fit ​​plate (27). A movable plate (29) is fixedly installed on the side of the top of the first snap-fit ​​plate (25) and the second snap-fit ​​plate (27) that are close to each other. The top of the maintenance platform (17) is provided with a second slide rail groove (210). The movable plate (29) is located in the second slide rail groove (210). A platform opening (12) is provided on the right side of the base plate (11). Wheels (13) are fixedly installed on the bottom of the base plate (11). The first lifting component (14) includes a first fixed plate (141) and a second fixed plate (148) fixedly installed on the front and rear ends of the top of the base plate (11). A moving groove (142) is provided on the top of the first fixed plate (141). A threaded rod (143) is movably installed inside the moving groove (142). A platform opening (12) is provided on the right side of the base plate (11). There is a motor (144), the output end of the motor (144) is fixedly connected to the threaded rod (143), a first mounting seat (145) is fixedly installed on the top left side of the first fixing plate (141), a second mounting seat (146) is movably installed inside the moving slot (142), the second mounting seat (146) is penetrated by the threaded rod (143), and a scissor linkage (147) is movably installed on the top of the first mounting seat (145) and the second mounting seat (146); The grading plate (15) is movably installed above the base plate (11) via the first lifting component (14). The front and rear ends of the bottom of the grading plate (15) are fixedly installed with a set of scissor-type connecting rods (147). The structure of the second lifting component (16) is the same as that of the first lifting component (14). The second lifting component (16) is fixedly installed on the top of the grading plate (15) via the first fixing plate (141) and the second fixing plate (148). The bottom of the inspection platform (17) is fixedly installed with the two sets of scissor-type connecting rods (147) of the second lifting component (16). The grading plate (15) and the second lifting component (16) are a set of lifting components, and the number can be set according to the actual application.

2. The maintenance platform for the interior of a steel chimney according to claim 1, characterized in that: The maintenance platform (17) is provided with a handrail (21) at the top, and a support rod (22) is fixedly installed at the bottom of the handrail (21). The handrail (21) is movably installed above the maintenance platform (17) through the support rod (22). A first slide rail groove (23) is provided at the top edge of the maintenance platform (17), and the bottom of the support rod (22) is inserted into the first slide rail groove (23).

3. The maintenance platform for the interior of a steel chimney according to claim 2, characterized in that: Both the second slide rail groove (210) and the first slide rail groove (23) are connected to the storage room (24) opened inside the maintenance platform (17).

4. The maintenance platform for the interior of a steel chimney according to claim 2, characterized in that: When the first snap-fit ​​plate (25) and the second snap-fit ​​plate (27) are located inside the storage chamber (24), the support rod (22) is engaged in the slot (26) of the first snap-fit ​​plate (25) and the second snap-fit ​​plate (27) away from the center of the storage chamber (24). When the first snap-fit ​​plate (25) and the second snap-fit ​​plate (27) extend out of the storage chamber (24), the support rod (22) is engaged in the slot (26) of the first snap-fit ​​plate (25) and the second snap-fit ​​plate (27) near the center of the storage chamber (24).

5. A maintenance platform for the interior of a steel chimney according to claim 1, characterized in that: The inspection platform (17) is provided with a protective net component (3) inside its side. The protective net component (3) includes a storage groove (31) opened inside the side of the inspection platform (17). One side of the storage groove (31) is connected to the storage chamber (24). A first bearing (32) is movably installed on the side of the storage groove (31) that is not connected to the storage chamber (24). A second bearing (33) is movably installed on the side of the first snap-fit ​​plate (25) near the storage groove (31). An extension arm (34) is movably connected between the first bearing (32) and the second bearing (33). A protective net (35) is provided on the inner side of the extension arm (34).

6. A maintenance platform for the interior of a steel chimney according to claim 5, characterized in that: The extension arm (34) is arc-shaped and can extend to both sides. When the first snap plate (25) is located inside the storage chamber (24), the extension arm (34) is located inside the storage slot (31).

7. A maintenance platform for the interior of a steel chimney according to claim 1, characterized in that: The difference between the second fixing plate (148) and the first fixing plate (141) is that the second fixing plate (148) does not have a drive assembly consisting of a threaded rod (143) and a motor (144) inside.

8. The maintenance platform for the interior of a steel chimney according to claim 1, characterized in that: The hinge joints of the scissor-type connecting rod (147) installed on the top of the first fixed plate (141) and the scissor-type connecting rod (147) installed on the top of the second fixed plate (148) are both fixedly connected to the connecting rod (149). The diameter of the inspection platform (17) is smaller than the diameter of the grading plate (15), the diameter of the grading plate (15) is smaller than the diameter of the base plate (11), and the diameter of the platform above the base plate (11) gets smaller and smaller.

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