An access platform

Abstract

The application relates to the technical field of overhaul platforms, and discloses an overhaul platform which comprises a platform frame, guiding wheels are fixedly connected around the platform frame in sequence, front and rear jumping plates and left and right jumping plates are laid around the top of the platform frame, the front and rear jumping plates and the left and right jumping plates are fixedly connected with the platform frame through jumping plate fixing clamps, fence vertical rods are arranged in the inner ring of the jumping plates, fence cross rods, fence supporting rods and fence steel wire ropes are fixedly connected to the outer side of the fence vertical rods; the overhaul platform is bidirectionally buffered by supporting springs and buffer springs when the guiding wheels are in contact with the inner wall of a boiler furnace, the extension distance of the guiding wheels outward is effectively increased, the buffering effect is ensured, the platform frame is in elastic contact with the inner wall of the boiler furnace when the platform frame is in contact with the inner wall of the boiler furnace, therefore, the safety of the overhaul platform is effectively ensured during the lifting of the platform frame, and the guiding wheels and the inner wall of the boiler furnace are prevented from colliding and being damaged.

Description

Technical Field

[0001] This invention relates to the field of maintenance platform technology, specifically to a maintenance platform. Background Technology

[0002] Boilers are prone to slagging or cracking during use. To ensure the safety of boiler operation, regular maintenance is required. Boiler furnace maintenance platforms are a type of support equipment for high-altitude boiler maintenance. Compared with existing scaffolding, they are easier to operate, allow for easy adjustment of the platform to different heights, and are suitable for working in different positions. This effectively improves the safety and convenience of existing boiler maintenance work, while also increasing the efficiency of boiler maintenance.

[0003] Generally, boiler maintenance platforms are fixedly connected to the platform support around the perimeter. The connection between the platform support and the guide wheels is rigid. Therefore, when the guide wheels come into contact with the inner wall of the furnace during use, it is very easy to cause the maintenance platform to shake, affecting its safety. In addition, existing maintenance platforms are often protected by safety ropes when they fall, but the protection effect is limited and cannot combine fall protection with guide wheels, thus affecting its effectiveness. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a maintenance platform that improves the protective effect of the guide wheels, provides elastic support and guidance for the guide wheels, restores rigidity during a fall, and locks the guide rollers to achieve auxiliary braking and ensure safe use.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a maintenance platform, comprising a platform frame, with guide wheels fixedly connected sequentially around the platform frame, and front and rear planks and left and right planks laid around the top of the platform frame. The front and rear planks and left and right planks are fixedly connected to the platform frame by plank fixing clips. A fence post is provided in the inner circle of the planks, and a fence crossbar, fence support bar, and fence wire rope are fixedly connected to the outer side of the fence post. A double buckle is provided between the fence post and the fence crossbar for fixing the fence post and the fence crossbar. The fence post is welded to the top of the platform frame by bolts. A hoisting assembly is also provided on the top of the platform, and guide wheels are provided around the platform. A winch is provided on the top of the platform frame, and the winch is connected to the hoisting rope through a reducer.

[0006] The guide wheel includes an outer sleeve and an inner sleeve, with a buffer spring between them. The outer sleeve is rotatably connected to the platform frame, and a support spring is also provided between them. A limit protrusion is provided on the rotatable connecting shaft between the outer sleeve and the platform frame. The outer sleeve is tilted downwards with a deflection angle of -5° to -42°. A guide wheel shaft is rotatably connected to the end of the inner sleeve, and a guide roller is fixedly connected to the outside of the guide wheel shaft. The guide wheel also has a first locking mechanism and a second locking mechanism. This design causes the guide wheel to tilt downwards and contact the inner wall of the boiler furnace. Therefore, when the guide roller contacts the inner wall of the boiler furnace, the support spring and buffer spring provide bidirectional buffering, effectively increasing the outward extension distance of the guide roller while ensuring the buffering effect. This ensures that the platform frame makes elastic contact with the inner wall of the boiler furnace when the guide wheel is in contact with it. Therefore, during the lifting and lowering of the platform frame, the safety of the maintenance platform is effectively guaranteed, avoiding damage caused by collision between the guide roller and the inner wall of the boiler furnace.

[0007] More preferably, the platform frame includes beams B1-B9, A1-A5, A2-A3, A4, and C1-C9 arranged in sequence, wherein beams A1-A5, A2-A3, and A4 are distributed perpendicularly to beams B1-B9 and C1-C9. Several beams are connected and fixed by beam fixing plates and beam joint plates. Beams B1-B9 are located between beams A2 and A3, and beams C1-C9 are distributed between beams A2, A3, and A4. Beams B1-B9 and C1-C9 are connected by folding joints. Beams B1-B9, A1-A5, A2-A3, A4, and C1-C9 are interconnected to form the platform frame. Beams B1-B9, A1-A5, A2-A3, A4, and C1-C9 are made of 2A12 material with a specification of ∠50×50. By using aluminum alloy, the overall weight is effectively reduced, the workload is lessened, and the safety of use is further improved.

[0008] Preferably, the top of the platform frame is equipped with a fall arrestor, and a rigging screw buckle B is fixedly connected to the top of the fall arrestor. A working rope is fixedly connected to the top of the rigging screw buckle B, and a safety rope is fixedly connected to the end of the working rope. In use, the safety rope connects to the worker, ensuring the worker's safety on the platform frame and preventing the worker from falling during work.

[0009] In a further preferred embodiment, a pad is laid on top of the front and rear planks and the left and right planks. The pad is generally "M"-shaped, with a top surface that is flat and has anti-slip patterns. The bottom feet of the "M"-shaped pads abut against each other, and a base plate is fixedly connected to the bottom of the bottom foot connection end. The included angle between the bottom feet of adjacent "M"-shaped pads is 50° to 90°, and reinforcing ribs are provided at the bottom feet of the pads. Compared with existing designs, this method achieves higher strength using lighter materials, further reducing the overall weight of the platform frame while ensuring the strength of the pads. The anti-slip surface treatment further improves safety during use.

[0010] More preferably, the hoisting assembly includes a support unit and a main hoisting unit, and a hoisting point assembly is provided between the support unit, the main hoisting unit and the platform frame. The hoisting assembly is connected to the platform frame through the hoisting point assembly and is used to support and suspend the platform frame.

[0011] More preferably, the support unit includes a support pole, with a support wire rope and a rigging screw A connecting the two sides of the support pole and the platform frame respectively. A cargo hook is provided between the support wire rope and the platform frame, and a rope clamp A is provided between the cargo hook and the support wire rope. An angle aluminum is provided between the support pole and the platform frame for fixing the support pole and the platform frame. The main lifting unit includes a lifting rope and an angle aluminum, which is fixedly connected to the platform frame. A rope clamp B for fixing is provided between the lifting rope and the angle aluminum. The lifting rope is configured in a "V" shape, and the two "V" shaped lifting ropes on both sides are joined and fixed by rope clamp C and then extend outward.

[0012] More preferably, the lifting point assembly includes a main lifting point and a reinforcing lifting point, and the lifting assembly is connected to the platform frame through the main lifting point and the reinforcing lifting point.

[0013] More preferably, the first locking mechanism includes an electromagnetic push rod, which is fixedly connected inside the outer sleeve rod. A push rod is fixedly connected to the external output end of the electromagnetic push rod. A limit block is provided at the end of the push rod. The limit block is slidably connected inside the outer sleeve rod. A limit pawl is provided at the bottom of the limit block. The first locking mechanism also includes a limit ratchet groove opened inside the inner sleeve rod. The limit block and the limit ratchet groove are movably engaged. A tension spring is provided between the limit block and the outer sleeve rod. An inclined surface is provided inside the limit block. The push rod abuts against the inclined surface.

[0014] More preferably, the second locking mechanism includes an electromagnetic pull rod fixedly connected inside the inner sleeve rod, a limit strip fixedly connected to the output end of the electromagnetic pull rod, a limit wheel provided inside the limit strip, the limit wheel fixedly connected to the outside of the guide wheel shaft, the limit wheel located between the guide rollers, an outer shell fixedly connected to the end of the inner sleeve rod on the outside of the limit strip, a return spring provided between the limit strip and the outer shell, the upper end of the limit strip fixedly connected to the output end of the electromagnetic pull rod, the lower end of the limit strip fixedly connected to the inside of the inner sleeve rod, and the limit strip sleeved on the outside of the limit wheel.

[0015] More preferably, when the electromagnetic push rod is energized, it pushes the push rod outward, and when the electromagnetic pull rod is energized, it pulls the limiting strip inward.

[0016] More preferably, the first locking mechanism and the second locking mechanism are externally electrically connected to a sensing mechanism. The sensing mechanism includes a support pad disposed at the bottom of the hoisting rope, the support pad being fixedly connected to the top of the platform frame, a connecting block being movably connected inside the support pad, the connecting block being fixedly connected to the bottom of the hoisting rope, a sensing spring being disposed between the connecting block and the support pad, and a trigger ring being disposed between the connecting block and the support pad. The trigger ring includes two electrical contacts, which are respectively disposed between the connecting block and the support pad. The trigger ring is electrically connected to an electromagnetic push rod and an electromagnetic pull rod, and the trigger ring is connected between the electromagnetic push rod, the electromagnetic pull rod and the external circuit. When the two electrical contacts are in contact, the electromagnetic push rod and the electromagnetic pull rod are energized.

[0017] Beneficial effects:

[0018] 1. When the maintenance platform comes into contact with the inner wall of the boiler furnace through the guide rollers, it uses support springs and buffer springs for bidirectional buffering, which effectively increases the outward extension distance of the guide rollers while ensuring the buffering effect. This makes the contact between the platform frame and the inner wall of the boiler furnace elastic, thus effectively ensuring the safety of the maintenance platform during the lifting and lowering process and avoiding damage caused by collision between the guide rollers and the inner wall of the boiler furnace.

[0019] 2. This maintenance platform adopts an "M" shape for its base plates. Compared with existing rectangular frame planks, it uses lighter materials to achieve higher strength, further reducing the overall weight of the platform frame. The foot angle between adjacent "M" shaped base plates is 50° to 90°. When the top surface of the base plate is subjected to top pressure, the two bottom feet generate lateral top pressure, which is received by the base plate. Due to the foot angle of 50° to 90°, the bearing strength of the top surface is increased, thereby ensuring the strength of the base plate. In addition, the surface is treated with anti-slip material to further improve the safety of use.

[0020] 3. This maintenance platform is constructed by using a support unit and a main lifting unit to form a hoisting assembly. The platform frame is hoisted using the hoisting assembly. The hoisting assembly is equipped with a winch, horizontal pulleys, and vertical pulleys. An electrical control box is also installed on the top of the platform frame. The electrical control box has a manual control panel on the outside for control. The operator uses the manual control panel to control the winch to drive the hoisting assembly. The main lifting unit and the support unit hoist the platform frame, thus completing the lifting and lowering control of the platform frame. The cooperation between the main lifting unit and the support unit effectively ensures the stability of the platform frame during the lifting process.

[0021] 4. This maintenance platform is inclined downwards by guide rollers to contact the inner wall of the boiler furnace. Therefore, when the guide rollers contact the inner wall of the boiler furnace, the support springs and buffer springs provide bidirectional buffering, effectively increasing the outward extension distance of the guide rollers while ensuring the buffering effect. This makes the contact between the platform frame and the inner wall of the boiler furnace elastic, thus effectively ensuring the safety of the maintenance platform during the lifting and lowering process and avoiding damage caused by collision between the guide rollers and the inner wall of the boiler furnace.

[0022] 5. This maintenance platform uses a limit bar to tighten the limit wheel, which in turn clamps the brake guide roller. As the guide roller rolls upward, the contact between the guide roller and the limit bar is further tightened during the rotation of the guide roller, improving the braking effect of the guide roller. Furthermore, the braking of the guide roller is rigid, which enhances the protection of the guide roller and ensures its safe use.

[0023] 6. This maintenance platform, through a first locking mechanism, a second locking mechanism, and an externally electrically connected sensing mechanism, allows the platform frame to slide downwards in the event of a lifting component failure. The connecting block moves downwards under the action of the sensing spring. The connecting block controls the connection of the two electrical contacts of the trigger ring. When energized, the electromagnetic push rod pushes the push rod outwards, and the electromagnetic pull rod pulls the limit bar inwards, thereby locking and braking the guide rollers. The outer sleeve rod and inner sleeve rod are locked and fixed. Furthermore, when the guide wheel deflects upwards, the contact pressure between the guide rollers and the inner wall of the boiler furnace increases, and the friction between the guide rollers and the inner wall of the boiler furnace increases, effectively reducing the descent speed of the platform frame or braking the platform frame's descent, thus improving the safety of the device. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the assembly state of the structural platform frame of the present invention;

[0025] Figure 2 This is a schematic diagram of the connection structure of the support and suspension unit of the present invention;

[0026] Figure 3 The structure of this invention Figure 1 Schematic diagram of the connection of the AA section main hoist unit structure;

[0027] Figure 4 This is a schematic diagram of the internal structure of the guide wheel of the present invention;

[0028] Figure 5 This is a top view of the guide wheel structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the cross-section of the padding for the left and right ramps and the front and rear ramps of the present invention.

[0030] Figure 7 This is a schematic diagram of the lifting point assembly of the present invention;

[0031] Figure 8 The structure of this invention Figure 4 Enlarged diagram of part B;

[0032] Figure 9 This is a schematic diagram of the sensing mechanism of the present invention.

[0033] In the diagram: 1. Guide wheel; 100. Outer sleeve rod; 101. Inner sleeve rod; 102. Buffer spring; 103. Guide wheel shaft; 104. Guide roller; 105. Support spring; 106. Electromagnetic push rod; 107. Push rod; 108. Limiting block; 109. Tension spring; 110. Limiting ratchet groove; 111. Electromagnetic pull rod; 112. Limiting strip; 113. Limiting wheel; 114. Outer shell; 115. Return spring; 2. Lifting point assembly; 201. Main lifting point; 3. Front and rear ramps; 4. Left and right ramps; 5. Ram fixing clips; 6. Beams B1-B9; 7. Beams A1 and A5; 8. Beam fixing pressure plate; 9. Fence support rod; 10. A2 11. A3 beam; 12. A4 beam; 13. Beam joint plate; 14. Folding joint; 15. Support pole; 16. Support wire rope; 17. Rigging spiral buckle A; 18. Cargo hook; 19. Rope clamp A; 20. Fence pole; 21. Fence wire rope; 22. Fence crossbar; 23. Double buckle; 24. C1-C9 beams; 25. Reinforced lifting point; 26. Angle aluminum; 27. Lifting rope; 28. Rope clamp B; 29. ​​Fall arrestor; 30. Working rope; 31. Rope clamp C; 32. Protective rope; 33. Support pad; 331. Connecting block; 332. Induction spring; 333. Trigger ring; 34. Pad; 341. Base plate; 342. Top surface. Detailed Implementation

[0034] 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.

[0035] Example 1

[0036] Please see Figure 1-4 A maintenance platform includes a platform frame, comprising beams B1-B9 (6), A1-A5 (7), A2-A3 (10), A4 (11), and C1-C9 (23) arranged sequentially. Beams A1-A5 (7), A2-A3 (10), and A4 (11) are perpendicular to beams B1-B9 (6) and C1-C9 (23). Several beams are connected and fixed by beam fixing plates 8 and beam joint plates 12. Beams B1-B9 (6) are located between beams A2 and A3 (10), and beams C1-C9 (23) are distributed between beams A2 and A3 (10) and beams A4 (11). Beams B1-B9 (6) and C1-C9 (23) are connected by folding joints 13. The beams B1-B9 (6), A1-A5 (7), A2-A3 (10), A4 (11), and C1-C9 (23) are interconnected to form the platform frame. Beam A5 (7) is made of Q235B material, while beams B1-B9 (6), A2, A3 (10), A4 (11), and C1-C9 (23) are made of 2A12 material, with a specification of ∠50×50. The use of aluminum alloy effectively reduces the overall weight, decreases workload, and further improves safety.

[0037] The platform frame is fixedly connected to guide wheels 1 around its perimeter. The top of the platform frame is covered with front and rear planks 3 and left and right planks 4. The front and rear planks 3 and left and right planks 4 are fixedly connected to the platform frame by plank fixing clips 5. The inner circle of the planks is equipped with fence posts 19. The outer side of the fence posts 19 is fixedly connected with fence crossbars 21, fence support rods 9 and fence wire ropes 20. Double buckles 22 are set between the fence posts 19 and the fence crossbars 21. The double buckles 22 are used to fix the fence posts 19 and the fence crossbars 21. The fence posts 19 are welded with steel plates and fixed to the top of the platform frame with bolts. The top of the platform is also equipped with a hoisting assembly. The four sides of the platform are equipped with guide wheels 1. The top of the platform frame is equipped with a winch. The winch is connected to the hoisting rope 26 through a reducer. The winch model is 2JM6×6.

[0038] The guide wheel 1 includes an outer sleeve rod 100 and an inner sleeve rod 101. A buffer spring 102 is provided between the outer sleeve rod 100 and the inner sleeve rod 101. The outer sleeve rod 100 is rotatably connected to the platform frame. A support spring 105 is provided between the outer sleeve rod 100 and the platform frame. A limit protrusion is provided on the rotatable connecting shaft between the outer sleeve rod 100 and the platform frame. The outer sleeve rod 100 is inclined downward and the deflection angle is -5° to -42°. A guide wheel shaft 103 is rotatably connected to the end of the inner sleeve rod 101. A guide roller 104 is fixedly connected to the outside of the guide wheel shaft 103.

[0039] A fall arrestor 28 is installed at the top of the platform frame. A rigging screw buckle B29 is fixedly connected to the top of the fall arrestor 28. A working rope 30 is fixedly connected to the top of the rigging screw buckle B29. A safety rope 32 is fixedly connected to the end of the working rope 30. In use, the safety rope 32 is connected to the worker to ensure the worker's safety on the platform frame and prevent the worker from falling during work.

[0040] During use, the platform frame is assembled inside the boiler furnace. Among them, beams 7 of A1 and A5 are made of Q235B material with ∠50×50×2951 and ∠50×50×7887 and galvanized surface. Beams 6 of B1-B9, beams 10 of A2 and A3, beam 11 of A4, and beams 23 of C1-C9 are made of 2A12 material. The specifications of beam 10 of A2 and A3 are I180×2951 and I180×7887; the specifications of beam 11 of A4 are I120×2951 and I120×7887; the specifications of beam 23 of C1-C9 are I120×2909; and the specifications of beam 6 of B1-B9 are I120×5691.

[0041] The operating range of the 1×135MW furnace platform at Jinan Steel is between 4527mm and 27100mm in elevation.

[0042] An auxiliary platform is set up at the turning point of the boiler, which makes the assembly and maintenance of the platform safe and convenient.

[0043] Workers stand on top of the platform frame and use the working rope 30 with the spiral buckle B29 and fall arrestor 28 to secure the safety rope 32. In the event of an accidental fall, the fall arrestor 28 will lock in place to ensure the worker's safety.

[0044] Furthermore, the platform frame is adapted to the boiler furnace wall, and the guide wheel 1 contacts the furnace wall. During the lifting and lowering of the platform frame, the guide wheel 1 contacts the boiler, causing the guide wheel 1 to tilt downwards and contact the inner wall of the boiler furnace. Therefore, when the guide roller 104 contacts the inner wall of the boiler furnace, the support spring 105 and the buffer spring 102 provide bidirectional buffering, effectively increasing the outward extension distance of the guide roller 104 while ensuring the buffering effect. This ensures that the platform frame makes elastic contact with the inner wall of the boiler furnace when it contacts the guide wheel 1. Therefore, during the lifting and lowering of the platform frame, the safety of the maintenance platform is effectively guaranteed, and damage caused by the collision between the guide roller 104 and the inner wall of the boiler furnace is avoided.

[0045] Example 2

[0046] Please see Figure 1-6Further based on Embodiment 1, a maintenance platform includes a platform frame. Guide wheels 1 are fixedly connected around the platform frame. Front and rear planks 3 and left and right planks 4 are laid around the top of the platform frame. The front and rear planks 3 and left and right planks 4 are fixedly connected to the platform frame by plank fixing clips 5. A fence post 19 is provided in the inner circle of the planks. A fence crossbar 21, a fence support 9 and a fence wire rope 20 are fixedly connected to the outer side of the fence post 19. A double buckle 22 is provided between the fence post 19 and the fence crossbar 21. The double buckle 22 is used to fix the fence post 19 and the fence crossbar 21. The fence post 19 is welded to the top of the platform frame by bolts. A hoisting assembly is also provided on the top of the platform. Guide wheels 1 are provided around the platform. A winch is provided on the top of the platform frame. The winch is connected to the hoisting rope 26 through a reducer.

[0047] A pad 34 is laid on top of the front and rear ramps 3 and the left and right ramps 4. The pad 34 is generally "M" shaped. The top of the "M" shaped pad 34 includes a top surface 342, which is flat and has anti-slip patterns. The bottom feet of the "M" shaped pads 34 abut against each other, and a base plate 341 is fixedly connected to the bottom of the bottom foot connection end. The included angle between the bottom feet of adjacent "M" shaped pads 34 is 50° to 90°. Reinforcing ribs are provided at the bottom feet of the pads 34. The pads 34 are fixed to the platform frame by bolts and laid on top of the front and rear ramps 3 and the left and right ramps 4.

[0048] Compared with existing rectangular frame planks, this design uses lighter materials to achieve higher strength, further reducing the overall weight of the platform frame. The foot angle between adjacent "M"-shaped pads 34 is 50° to 90°. When the top surface 342 of the pad 34 is subjected to top pressure, the two bottom feet generate lateral top pressure, which is received by the base plate 341. Since the foot angle is 50° to 90°, the bearing strength of the top surface 342 is increased, thereby ensuring the strength of the pad 34. In addition, the surface is treated with anti-slip material to further improve the safety of use.

[0049] Example 3

[0050] Please see Figure 2-3 and Figure 7Based on Embodiment 1, the distinguishing feature is that a maintenance platform includes a platform frame, with guide wheels 1 fixedly connected around the platform frame. Front and rear planks 3 and left and right planks 4 are laid around the top of the platform frame. The front and rear planks 3 and left and right planks 4 are fixedly connected to the platform frame via plank fixing clips 5. A fence post 19 is provided within the inner circle of the planks. A fence crossbar 21, fence support rod 9, and fence wire rope 20 are fixedly connected to the outer side of the fence post 19. Double buckles 22 are provided between the fence post 19 and the fence crossbar 21 for fixing the fence post 19 and the fence crossbar 21. The fence post 19 is welded from steel plates and fixedly connected to the top of the platform frame with bolts. A hoisting assembly is also provided on the top of the platform. Guide wheels 1 are provided around the platform. A winch is provided on the top of the platform frame. The winch is connected to a reducer and a hoisting rope 26. The winch model is 2JM6×6.

[0051] The hoisting assembly includes a support unit and a main hoisting unit. A hoisting point assembly 2 is provided between the support unit, the main hoisting unit and the platform frame. The hoisting assembly is connected to the platform frame through the hoisting point assembly 2 to support and suspend the platform frame.

[0052] The support unit includes a support pole 14. Support wire ropes 15 and rigging screw buckles A16 are connected to both sides of the support pole 14 and the platform frame, respectively. A hook 17 is provided between the support wire rope 15 and the platform frame. A rope clamp A18 is provided between the hook 17 and the support wire rope 15. An angle aluminum 25 is provided between the support pole 14 and the platform frame. The angle aluminum 25 is used to fix the support pole 14 and the platform frame.

[0053] The main lifting unit includes a lifting rope 26 and an angle aluminum 25. The lifting rope 26 has a diameter of 70mm. The angle aluminum 25 is fixedly connected to the platform frame. A rope clamp B27 for fixing is provided between the lifting rope 26 and the angle aluminum 25. The lifting rope 26 is set in a "V" shape. The two "V" shaped lifting ropes 26 on both sides are fixed together by the rope clamp C31 and then extend outward.

[0054] The lifting point assembly 2 includes a main lifting point 201 and a reinforcing lifting point 24. The lifting assembly is connected to the platform frame through the main lifting point 201 and the reinforcing lifting point 24.

[0055] The hoisting assembly is constructed using a support unit and a main hoisting unit. The platform frame is then hoisted using this assembly. The hoisting assembly is equipped with a winch, horizontal pulleys, and vertical pulleys. An electrical control box is also installed on the top of the platform frame, with a manual control panel on the outside. Workers use the manual control panel to control the winch to drive the hoisting assembly. The main hoisting unit and the support unit then lift the platform frame, completing the lifting and lowering control of the platform frame. The cooperation between the main hoisting unit and the support unit effectively ensures the stability of the platform frame during the lifting and lowering process.

[0056] Example 4

[0057] Please see Figure 1-9 Further based on Embodiment 1, a maintenance platform includes a platform frame. Guide wheels 1 are fixedly connected around the platform frame. Front and rear planks 3 and left and right planks 4 are laid around the top of the platform frame. The front and rear planks 3 and left and right planks 4 are fixedly connected to the platform frame by plank fixing clips 5. A fence post 19 is provided in the inner circle of the planks. A fence crossbar 21, a fence support 9 and a fence wire rope 20 are fixedly connected to the outer side of the fence post 19. A double buckle 22 is provided between the fence post 19 and the fence crossbar 21. The double buckle 22 is used to fix the fence post 19 and the fence crossbar 21. The fence post 19 is welded to the top of the platform frame by bolts. A hoisting assembly is also provided on the top of the platform. Guide wheels 1 are provided around the platform. A winch is provided on the top of the platform frame. The winch is connected to the hoisting rope 26 through a reducer.

[0058] The guide wheel 1 includes an outer sleeve rod 100 and an inner sleeve rod 101. A buffer spring 102 is provided between the outer sleeve rod 100 and the inner sleeve rod 101. The outer sleeve rod 100 is rotatably connected to the platform frame. A support spring 105 is provided between the outer sleeve rod 100 and the platform frame. A limit protrusion is provided on the rotatable connecting shaft between the outer sleeve rod 100 and the platform frame. The outer sleeve rod 100 is tilted downward and the deflection angle is -5° to -42°. A guide wheel shaft 103 is rotatably connected to the end of the inner sleeve rod 101. A guide roller 104 is fixedly connected to the outside of the guide wheel shaft 103. The guide wheel 1 is also provided with a first locking mechanism and a second locking mechanism. The guide roller 1 is tilted downwards to contact the inner wall of the boiler furnace. Therefore, when the guide roller 104 contacts the inner wall of the boiler furnace, the support spring 105 and the buffer spring 102 provide bidirectional buffering, effectively increasing the outward extension distance of the guide roller 104 while ensuring the buffering effect. This ensures that the platform frame makes elastic contact with the inner wall of the boiler furnace when it passes through the guide roller 1. Therefore, during the lifting and lowering of the platform frame, the safety of the maintenance platform is effectively guaranteed, and damage caused by the collision between the guide roller 104 and the inner wall of the boiler furnace is avoided.

[0059] The first locking mechanism includes an electromagnetic push rod 106, which is fixedly connected inside the outer sleeve rod 100. A push rod 107 is fixedly connected to the external output end of the electromagnetic push rod 106. A limit block 108 is provided at the end of the push rod 107. The limit block 108 is slidably connected inside the outer sleeve rod 100. A limit pawl is provided at the bottom of the limit block 108. The first locking mechanism also includes a limit ratchet groove 110 opened inside the inner sleeve rod 101. The limit block 108 and the limit ratchet groove 110 are movably engaged. A tension spring 109 is provided between the limit block 108 and the outer sleeve rod 100. An inclined surface is provided inside the limit block 108. The push rod 107 abuts against the inclined surface.

[0060] The second locking mechanism includes an electromagnetic pull rod 111 fixedly connected inside the inner sleeve rod 101. The output end of the electromagnetic pull rod 111 is fixedly connected to a limit strip 112. A limit wheel 113 is provided inside the limit strip 112. The limit wheel 113 is fixedly connected to the outside of the guide wheel shaft 103 and is located between the guide rollers 104. An outer shell 114 is provided outside the limit strip 112 and fixedly connected to the end of the inner sleeve rod 101. A return spring 115 is provided between the limit strip 112 and the outer shell 114. The upper end of the limit strip 112 is fixedly connected to the output end of the electromagnetic pull rod 111, and the lower end of the limit strip 112 is fixedly connected to the inside of the inner sleeve rod 101. The limit strip 112 is sleeved on the outside of the limit wheel 113.

[0061] The first locking mechanism and the second locking mechanism are externally electrically connected to a sensing mechanism. The sensing mechanism includes a support plate 33 at the bottom of the suspension rope 26. The support plate 33 is fixedly connected to the top of the platform frame. A connecting block 331 is movably connected inside the support plate 33. The connecting block 331 is fixedly connected to the bottom of the suspension rope 26. A sensing spring 332 is provided between the connecting block 331 and the support plate 33. A trigger ring 333 is provided between the connecting block 331 and the support plate 33. The trigger ring 333 includes two electrical contacts, which are respectively provided between the connecting block 331 and the support plate 33. The trigger ring 333 is electrically connected to the electromagnetic push rod 106 and the electromagnetic pull rod 111. The trigger ring 333 is connected between the electromagnetic push rod 106, the electromagnetic pull rod 111 and the external circuit. When the two electrical contacts are in contact, the electromagnetic push rod 106 and the electromagnetic pull rod 111 are energized.

[0062] When the hoisting components malfunction, the platform frame falls and slides downwards. The tension of the hoisting rope 26 on the connecting block 331 decreases, and the connecting block 331 moves downwards under the action of the induction spring 332. The two electrical contacts of the control trigger ring 333 are connected by the connecting block 331. When the electromagnetic push rod 106 is energized, it pushes the push rod 107 outwards. When the electromagnetic pull rod 111 is energized, it pulls the limit bar 112 inwards.

[0063] When the electromagnetic pull rod 111 is energized, it pulls the limiting strip 112 inward, causing the limiting strip 112 to retract and clamp the limiting wheel 113. The limiting strip 112 pulls the return spring 115, causing the limiting strip 112 to clamp the brake guide roller 104. The guide roller 104 rolls upward, further tightening the contact between the guide roller 104 and the limiting strip 112 during rotation, thus improving the braking effect of the guide roller 104. The braking of the guide roller 104 is rigid, thereby improving the protection effect of the guide roller 104 and ensuring the safety of the guide roller 104 in use.

[0064] When the electromagnetic push rod 106 is energized, it pushes the push rod 107 outward. The push rod 107 pushes the limiting block 108. Under the action of the push rod 107, the limiting block 108 moves downward, causing the limiting block 108 and the limiting ratchet 110 of the inner sleeve rod 101 to engage, locking the outer sleeve rod 100 and the inner sleeve rod 101. As the platform frame falls downward, it slides, causing the guide wheel 1 to deflect upward, and the outer sleeve rod 100 and the inner sleeve rod 101 are locked. When the guide wheel 1 deflects upward, the contact pressure between the guide roller 104 and the inner wall of the boiler furnace increases, and the friction between the guide roller 104 and the inner wall of the boiler furnace increases, thereby effectively reducing the falling speed of the platform frame or braking the descent of the platform frame.

[0065] Through the first locking mechanism, the second locking mechanism, and the externally electrically connected sensing mechanism, in the event of a malfunction in the hoisting components, the platform frame falls and slides downwards. The connecting block 331 moves downwards under the action of the sensing spring 332. The connecting block 331 controls the connection of the two electrical contacts of the trigger ring 333. When the electromagnetic push rod 106 is energized, it pushes the push rod 107 outwards. When the electromagnetic pull rod 111 is energized, it pulls the limit bar 112 inwards, thereby locking and braking the guide roller 104. The outer sleeve rod 100 and the inner sleeve rod 101 are locked and fixed. As a result, when the guide wheel 1 deflects upwards, the contact pressure between the guide roller 104 and the inner wall of the boiler furnace increases, and the friction between the guide roller 104 and the inner wall of the boiler furnace increases, thereby effectively reducing the falling speed of the platform frame or braking the descent of the platform frame, and improving the safety of the device.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A maintenance platform, characterized in that: The platform includes a platform frame, with guide wheels (1) fixedly connected around the platform frame. Front and rear planks (3) and left and right planks (4) are laid around the top of the platform frame. The front and rear planks (3) and left and right planks (4) are fixedly connected to the platform frame through plank fixing clips (5). A fence post (19) is set in the inner circle of the plank. A fence crossbar (21), fence support (9) and fence wire rope (20) are fixedly connected to the outside of the fence post (19). A double buckle (22) is set between the fence post (19) and the fence crossbar (21). The double buckle (22) is used to fix the fence post (19) and the fence crossbar (21). A hoisting assembly is set on the top of the platform. Guide wheels (1) are set around the four sides of the platform. The guide wheel (1) includes an outer sleeve rod (100) and an inner sleeve rod (101). A buffer spring (102) is provided between the outer sleeve rod (100) and the inner sleeve rod (101). The outer sleeve rod (100) is rotatably connected to the platform frame. A support spring (105) is provided between the outer sleeve rod (100) and the platform frame. A limit protrusion is provided on the rotatable connecting shaft between the outer sleeve rod (100) and the platform frame. The outer sleeve rod (100) is inclined downward and the deflection angle is -5° to -42°. The end of the inner sleeve rod (101) is rotatably connected to a guide wheel shaft (103). A guide roller (104) is fixedly connected to the outside of the guide wheel shaft (103). The guide wheel (1) is also provided with a first locking mechanism and a second locking mechanism. The second locking mechanism includes an electromagnetic pull rod (111) fixedly connected inside the inner sleeve rod (101), a limit bar (112) fixedly connected to the output end of the electromagnetic pull rod (111), a limit wheel (113) provided inside the limit bar (112), the limit wheel (113) fixedly connected to the outside of the guide wheel shaft (103), the limit wheel (113) located between the guide rollers (104), an outer shell (114) fixedly connected to the end of the inner sleeve rod (101) provided outside the limit bar (112), a return spring (115) provided between the limit bar (112) and the outer shell (114), the upper end of the limit bar (112) fixedly connected to the output end of the electromagnetic pull rod (111), the lower end of the limit bar (112) fixedly connected to the inside of the inner sleeve rod (101), and the limit bar (112) sleeved on the outside of the limit wheel (113); When the electromagnetic push rod (106) is energized, it pushes the push rod (107) outward, and when the electromagnetic pull rod (111) is energized, it pulls the limiting strip (112) inward. The first locking mechanism and the second locking mechanism are externally electrically connected to a sensing mechanism. The sensing mechanism includes a support plate (33) at the bottom of the suspension rope (26). The support plate (33) is fixedly connected to the top of the platform frame. A connecting block (331) is movably connected inside the support plate (33). The connecting block (331) is fixedly connected to the bottom of the suspension rope (26). A sensing spring (332) is provided between the connecting block (331) and the support plate (33). A trigger ring (333) is provided between the connecting block (331) and the support pad (33). The trigger ring (333) includes two electrical contacts, which are respectively located between the connecting block (331) and the support pad (33). The trigger ring (333) is electrically connected to the electromagnetic push rod (106) and the electromagnetic pull rod (111). The trigger ring (333) is connected between the electromagnetic push rod (106), the electromagnetic pull rod (111) and the external circuit. When the two electrical contacts are in contact, the electromagnetic push rod (106) and the electromagnetic pull rod (111) are energized.

2. The maintenance platform according to claim 1, characterized in that: The top of the platform frame is equipped with a fall arrestor (28), and the top of the fall arrestor (28) is fixedly connected to a rigging screw buckle B (29). The top of the rigging screw buckle B (29) is fixedly connected to a working rope (30), and the end of the working rope (30) is fixedly connected to a protective rope (32).

3. The maintenance platform according to claim 1, characterized in that: The front and rear ramps (3) and the left and right ramps (4) are covered with pads (34). The pads (34) are in the shape of an "M". The top of the "M" shaped pads (34) includes a top surface (342). The top surface (342) is set as a plane and has anti-slip patterns. The bottom feet of the "M" shaped pads (34) abut against each other. The bottom of the bottom foot connection end is fixedly connected to a base plate (341). The included angle between the bottom feet of adjacent "M" shaped pads (34) is 50° to 90°. The bottom feet of the pads (34) are provided with reinforcing ribs.

4. The maintenance platform according to claim 1, characterized in that: The hoisting assembly includes a support unit and a main hoisting unit. A hoisting point assembly (2) is provided between the support unit, the main hoisting unit and the platform frame. The hoisting assembly is connected to the platform frame through the hoisting point assembly (2) to support and suspend the platform frame.

5. A maintenance platform according to claim 4, characterized in that: The support unit includes a support pole (14), and a support wire rope (15) and a rigging screw buckle A (16) are respectively connected between the two sides of the support pole (14) and the platform frame. A cargo hook (17) is provided between the support wire rope (15) and the platform frame. A rope clamp A (18) is provided between the cargo hook (17) and the support wire rope (15). An angle aluminum (25) is provided between the support pole (14) and the platform frame. The angle aluminum (25) is used to fix the support pole (14) and the platform frame. The main lifting unit includes a lifting rope (26) and an angle aluminum (25). The angle aluminum (25) is fixedly connected to the platform frame. A rope clamp B (27) for fixing is provided between the lifting rope (26) and the angle aluminum (25). The lifting rope (26) is set in a "V" shape. The two "V" shaped lifting ropes (26) are combined and fixed by the rope clamp C (31) and then extend outward.

6. The maintenance platform according to claim 5, characterized in that: The lifting point assembly (2) includes a main lifting point (201) and a reinforcing lifting point (24), and the lifting assembly is connected to the platform frame through the main lifting point (201) and the reinforcing lifting point (24).

7. The maintenance platform according to claim 1, characterized in that: The first locking mechanism includes an electromagnetic push rod (106), which is fixedly connected inside the outer sleeve rod (100). The external output end of the electromagnetic push rod (106) is fixedly connected to a push rod (107). A limit block (108) is provided at the end of the push rod (107). The limit block (108) is slidably connected inside the outer sleeve rod (100). A limit pawl is provided at the bottom of the limit block (108). The first locking mechanism also includes a limit ratchet groove (110) opened inside the inner sleeve rod (101). The limit block (108) and the limit ratchet groove (110) are movably engaged. A tension spring (109) is provided between the limit block (108) and the outer sleeve rod (100). An inclined surface is provided inside the limit block (108). The push rod (107) abuts against the inclined surface.

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