An access platform with orifice closure function

Abstract

The application relates to the technical field of overhaul of a hole of a gate slot of a hydropower station, in particular to an overhaul platform with an orifice sealing function; the overhaul platform comprises a platform, a handrail and a falling prevention device; the platform is connected with the falling prevention device, and the handrail is arranged on the platform close to the falling prevention device; the falling prevention device comprises a falling prevention net connected with the platform; falling prevention supports for supporting the falling prevention net are arranged on the lower sides of the falling prevention net; the bottom of the falling prevention support is provided with casters facilitating folding and / or unfolding of the falling prevention net and the falling prevention support; the falling prevention net is connected with the falling prevention support; the telescopic rod of the falling prevention support is connected with an inner cavity formed in the platform, and the telescopic rod reciprocates in the inner cavity of the platform; compared with the traditional overhaul platform in the prior art, the application reduces the safety risk of the gate overhaul work of the hydropower station and improves the efficiency of the overhaul work.

Description

Technical Field

[0001] This application relates to the field of gate slot hole inspection technology for hydropower station, specifically to an inspection platform with orifice sealing function. Background Technology

[0002] Currently, the gate slots of hydropower station gates mainly house metal structures such as gates, tie rods, and hoists. The gate slots contain platforms at different elevations. During maintenance of the gates, tie rods, and hoists, these platforms need to be enclosed to form maintenance platforms. Traditional methods primarily use steel cover plates for closure, requiring multiple hoisting operations and lacking safety protection devices for maintenance personnel, resulting in high safety risks and low work efficiency during maintenance. Therefore, a maintenance platform is needed that can quickly close the gate slot openings, minimize the number of hoisting operations, facilitate convenient and fast hoisting, reduce safety risks during maintenance, and improve maintenance efficiency.

[0003] For example, a Chinese patent application, with publication number CN213806516U and publication date of July 27, 2021, entitled "A Foldable Maintenance Platform," discloses the following technical solution: This utility model belongs to the field of maintenance equipment and specifically discloses a foldable maintenance platform, including a fixed platform, a movable platform, side railings, a front railing, a lifting device, and a platform support frame; the side railings are rotatably connected to a column or wall; the lifting device is provided in two sets, each set including a drum, a drum hand crank, and a steel wire rope wound on the drum; the platform support frame is provided in at least two sets, including a support plate, a mounting plate, and an inclined plate, and the mounting plate is rotatably connected to the column or wall through several rotating connectors.

[0004] The maintenance platform in the aforementioned patent has a flip-up structure that can be selectively unfolded or retracted under the action of a lifting device, saving space. However, the maintenance platform in the aforementioned patent lacks relevant devices for safety protection of maintenance personnel, resulting in excessively high safety risks during maintenance work. Furthermore, it cannot be used to seal the openings of the gate slots of hydropower station gates. Summary of the Invention

[0005] To address the problems existing in the prior art, this application provides a maintenance platform with an orifice sealing function that can reduce safety risks during maintenance work, improve maintenance efficiency, and facilitate storage. To achieve the above-mentioned technical effects, the specific technical solution of this application is as follows: A maintenance platform with an orifice closure function includes a platform, railings, and a fall arrestor. The platform and the fall arrestor are connected, and the railings are installed on the platform near the fall arrestor. The fall arrestor includes a fall arrest net connected to the platform. Fall arrest brackets supporting the fall arrest net are provided on both sides below the net. Casters are provided at the bottom of the fall arrest brackets to facilitate the folding and / or unfolding of the fall arrest net. The fall arrest net is connected to the fall arrest brackets. The telescopic rod of the fall arrest brackets is connected to an internal cavity opened inside the platform, and the telescopic rod reciprocates within the platform's internal cavity.

[0006] Furthermore, the platform is provided with multiple fall protection net fixing rings on the side near the fall protection device, and the fall protection net is connected to the multiple fall protection net fixing rings; the platform includes a folding platform and a main platform; the two sides of the main platform are connected to the folding platform through multiple heavy-duty hinges, and the folding platform is folded downwards and / or unfolded outwards through multiple heavy-duty hinges.

[0007] Furthermore, the fall arrestor is equipped with a tension spring hook to fix the fall arrestor net to the platform; the fall arrestor net is tied to the fall arrestor by a rope knot; a tension spring is provided on the outside of the folding platform, and the tension spring is connected to the tension spring hook.

[0008] Furthermore, the inner cavity is located inside the folding platform near the fall arrestor; the inner cavity is equipped with a telescopic rod sleeve to prevent the telescopic rod from being fully pulled out; the telescopic rod extends and retracts inside the telescopic sleeve; and the end of the telescopic rod is provided with a circular plate with a diameter larger than the inner diameter of the telescopic sleeve.

[0009] Furthermore, the telescopic rod has door bolt holes at both ends along its length to facilitate fixing the telescopic rod; the folding platform has a door bolt at one end near the anti-fall device; the door bolt is located above the inner cavity of the folding platform.

[0010] Furthermore, the folding platform includes a folding platform frame and a patterned plate; the folding platform frame includes a folding frame, longitudinal beams, and a lower crossbeam; a lower crossbeam is provided on the outer side of the folding frame; a longitudinal beam is provided at the lower center of the folding frame and is connected to the folding frame; the main platform includes a main platform frame and a patterned plate; the main platform frame includes a main frame and longitudinal beams; a longitudinal beam is provided at the lower center of the main frame and is connected to the main frame; the patterned plate is installed on the upper surface of the main platform frame and the folding platform frame; the folding frame and the main frame are connected by multiple heavy-duty hinges.

[0011] Furthermore, the heavy-duty hinge includes a first hinge seat and a second hinge seat; the first hinge seat and the second hinge seat are connected by a first pin, and both the first hinge seat and the second hinge seat can rotate around the first pin; a hinge pad is respectively provided above the first hinge seat and the second hinge seat; the hinge pad above the first hinge seat is connected to the first hinge seat by an internal hex screw; the hinge pad above the second hinge seat is connected to the second hinge seat by an internal hex screw.

[0012] Furthermore, an industrial socket for powering the electric actuator is provided on the top of the lower crossbeam; the industrial socket is connected to the electrical cabinet via wires, and the electrical cabinet is connected to the electric actuator via wires; the electrical cabinet is fixedly installed below the main platform; the electric actuator is installed below the platform; one end of the electric actuator is connected to the electric actuator connector seat, and the other end of the electric actuator is connected to the longitudinal beam of the main platform; the electric actuator connector seat is located at the bottom of the folding platform.

[0013] Furthermore, the upper surface of the main platform is provided with four lifting rings; the lifting rings are made of bent round steel; the lifting rings are connected to bolt holes opened on the upper surface of the main platform; the bottom of the lower crossbeam is provided with multiple wheels to facilitate the overall movement of the platform; the patterned plates of the folding platform and the main platform are both aluminum alloy patterned plates that are easy for people to walk on.

[0014] Furthermore, the railing includes a handrail and a fixing structure; the handrail is connected to the fixing structure, and the fixing structure is fixedly installed on the platform; the handrail is laid flat on the platform or fixed vertically on the platform via the fixing structure; the fixing structure includes a kick plate and two handrail bases; the two handrail bases are fixedly installed on the platform, and the two ends of the kick plate are respectively connected to the two handrail bases; the two ends of the bottom of the railing are respectively connected to the two handrail bases via a second pin; the two handrail bases are also provided with quick-release pins that can pass through the handrail bases and the handrail; the second pin is also provided with a cotter pin to prevent the second pin from being pulled out.

[0015] Based on the above technical solution, the beneficial effects of this application are as follows: 1. This utility model adopts a platform, railings and anti-fall devices, which reduces the safety risks of hydropower station gate maintenance work and improves the efficiency of maintenance work compared with the traditional maintenance platform in the prior art.

[0016] 2. This utility model uses a fall protection device to completely block the opening of the hydropower gate, preventing personnel on the platform for maintenance or other workers above the opening from falling through the opening, thus improving the overall safety of the hydropower gate.

[0017] 3. The fall protection device of this utility model adopts a fall protection net, casters, a fall protection bracket and a telescopic rod sleeve, which makes the fall protection net easy to put away and unfold, and achieves the technical effect of easy storage and easy unfolding of the fall protection net.

[0018] 4. The fall arrestor bracket of this utility model uses a tension spring hook and a tension spring of the folding platform to fix the fall arrestor net to the folding platform after it is folded, thereby ensuring the stability of the fall arrestor net when it is hoisted by the maintenance platform.

[0019] 5. Since the platform itself is larger than the orifice diameter of the hydropower gate, the platform of this utility model adopts a folding platform and a main platform. The folding platform is folded by heavy-duty hinges and electric push rods, so that the platform can easily pass through the orifice when it is lifted.

[0020] 6. The railing of this utility model adopts a handrail and a fixing structure, which allows the handrail to be placed flat on the platform or fixed vertically on the platform through the fixing structure, which facilitates the storage and lifting of the maintenance platform.

[0021] 7. The multiple wheels and anti-fall casters at the bottom of the lower crossbeam of the folding platform of this utility model facilitate the overall movement of the maintenance platform to the designated maintenance position, making it more convenient and faster.

[0022] 8. The main platform of this utility model is equipped with four lifting rings, which makes the lifting of the maintenance platform more stable. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0024] Figure 2 This is a schematic diagram of the platform structure.

[0025] Figure 3 This is a structural diagram of a lifting ring.

[0026] Figure 4 This is a structural diagram of the railing.

[0027] Figure 5 This is a structural perspective diagram of the main platform.

[0028] Figure 6 This is a perspective view of the folding platform structure.

[0029] Figure 7 This is a partial structural diagram of the fall arrestor.

[0030] Figure 8 This is a structural diagram of the telescopic pole and the fall arrestor.

[0031] Figure 9 This is a front view diagram of a heavy-duty hinge.

[0032] Figure 10 This is a 3D schematic diagram of a heavy-duty hinge.

[0033] Figure 11 This is a bottom view of the present invention.

[0034] In the attached diagram: 1-railing; 2-fall protection device; 3-folding platform; 4-lifting ring; 5-main platform; 6-wheel; 7-industrial socket; 8-lower crossbeam; 9-electric actuator connector; 10-electric actuator; 11-longitudinal beam; 12-heavy-duty hinge; 13-round steel; 14-washer; 15-first nut; 16-quick-release pin; 17-second pin; 18-kick plate; 19-handrail; 20-handrail base; 21-cotter pin ; 22-Anti-fall net fixing ring; 23-Patterned plate; 24-Main platform frame; 25-Telescopic rod sleeve; 26-Tension spring; 27-Folding platform frame; 28-Anti-fall net; 29-Anti-fall bracket; 30-Cast wheel; 31-Tension spring hook; 32-Door latch hole; 33-Telescopic rod; 34-First hinge seat; 35-Second hinge seat; 36-Hinge pad; 37-Second nut; 38-First pin; 39-Electrical cabinet. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0036] Example 1 like Figure 1 and Figure 11As shown, a maintenance platform with an orifice closure function includes a platform, a railing 1, and a fall arrestor 2. The platform and the fall arrestor 2 are connected, and the railing 1 is installed on the platform near the fall arrestor 2. The fall arrestor 2 includes a fall arrestor net 28, which is connected to the platform. Fall arrestor brackets 29 are provided on both sides below the fall arrestor net 28 to support it. Casters 30 are provided at the bottom of the fall arrestor brackets 29 to facilitate the folding and / or unfolding of the fall arrestor net 28. Brake pedals can also be installed on the casters 30 to fix the platform on a horizontal plane, thereby... To prevent the platform from swaying during operation; the fall protection net 28 is connected to the fall protection bracket 29; the fall protection net 28 is equipped with specially extended ropes around its perimeter for connecting to the fall protection bracket 29 via rope ties; the telescopic rod 33 of the fall protection bracket 29 is connected to the inner cavity opened inside the platform, and the telescopic rod 33 reciprocates within the inner cavity of the platform; the reciprocating motion within the inner cavity of the platform means that when it is necessary to pull out the fall protection net 28, the telescopic rod 33 is pulled to extend it out of the inner cavity of the platform; when it is necessary to retract the fall protection net 28, the telescopic rod 33 is pushed back into the inner cavity of the platform.

[0037] Example 2 like Figure 1 and Figure 11 As shown, a maintenance platform with an orifice closure function includes a platform, a railing 1, and a fall arrestor 2. The platform and the fall arrestor 2 are connected, and the railing 1 is installed on the platform near the fall arrestor 2. The fall arrestor 2 includes a fall arrestor net 28, which is connected to the platform. Fall arrestor brackets 29 are provided on both sides below the fall arrestor net 28 to support it. Casters 30 are provided at the bottom of the fall arrestor brackets 29 to facilitate the folding and / or unfolding of the fall arrestor net 28. Brake pedals can also be installed on the casters 30. 28 is connected to the fall arrestor 29; the fall arrestor 28 is provided with specially extended ropes around its perimeter for connecting to the fall arrestor 29 via rope ties; the telescopic rod 33 of the fall arrestor 29 is connected to the inner cavity opened inside the platform, and the telescopic rod 33 reciprocates within the inner cavity of the platform; the reciprocating motion within the inner cavity of the platform means that when the fall arrestor 28 needs to be pulled out, the telescopic rod 33 is pulled to extend it out of the inner cavity of the platform; when the fall arrestor 28 needs to be retracted, the telescopic rod 33 is pushed back into the inner cavity of the platform.

[0038] like Figure 5 and Figure 6 As shown, multiple fall protection net fixing rings 22 are provided on the side of the platform near the fall protection device 2, and the fall protection net 28 is connected to the multiple fall protection net fixing rings 22; the extension rope on the fall protection net 28 is connected to the fall protection net fixing rings 22 through rope ties; as shown Figure 2 As shown, the platform includes a folding platform 3 and a main platform 5; the two sides of the main platform 5 are connected to the folding platform 3 by multiple heavy-duty hinges 12, and the folding platform 3 is folded downward and / or unfolded outward by multiple heavy-duty hinges 12.

[0039] like Figure 6 As shown, the fall arrestor 29 is equipped with tension spring hooks 31 for fixing the fall arrestor net 28 to the platform; the fall arrestor net 28 is secured to the fall arrestor 29 by rope knots; as shown Figure 7 As shown, a tension spring 26 is provided on the outer side of the folding platform 3, and the tension spring 26 is connected to the tension spring hook 31. When the fall arrest net 28 is folded back, the tension spring 26 is connected to the tension spring hook 31 to pull the fall arrest device 2, so that it can be stably fixed on the platform during the lifting operation. The fall arrest net 28 is made of polyester fiber, polyethylene or stainless steel. The holes on the fall arrest net 28 are generally selected to be 2cm~5cm long, 2cm~5cm wide and 4cm2~25cm2 in area. The diameter of the net rope of the fall arrest net 28 is 4mm~10mm, which prevents the workers and tools of the water and electricity gate from falling from the height and reduces the safety hazards.

[0040] like Figure 6 As shown, the inner cavity is located inside the folding platform 3 near one end of the fall arrestor 2; the inner cavity is a cavity opened inside the folding platform 3 to allow the telescopic rod 33 to move freely in and out; the inner cavity is provided with a telescopic rod sleeve 25 to prevent the telescopic rod 33 from being fully pulled out; the telescopic rod 33 extends and retracts inside the telescopic sleeve; the end of the telescopic rod 33 is provided with a circular piece with a diameter larger than the inner diameter of the telescopic sleeve; when the telescopic rod 33 is pulled out until the circular piece abuts against the telescopic sleeve and the telescopic rod 33 can no longer be pulled out, the telescopic rod 33 is fully pulled out, and the fall arrestor net 28 is also fully deployed.

[0041] like Figure 8 As shown, the telescopic rod 33 has door latch holes 32 at both ends along its length to facilitate fixing the telescopic rod 33; the door latch holes 32 near the inner cavity are used to fix the telescopic rod 33 when it is hoisted, and the door latch holes 32 away from the inner cavity are used to fix the telescopic rod 33 when the fall protection net 28 is fully extended; the folding platform 3 has a door latch at one end near the fall protection device 2; the door latch is located above the inner cavity of the folding platform 3; when the telescopic rod 33 extends and moves until the door latch hole 32 is directly below the door latch, the latch on the door latch is inserted into the door latch hole 32 to fix the telescopic rod 33; the door latch is a common and mature existing technology, and its structure is completely consistent with the door latch in daily life, so it will not be described in detail here.

[0042] Example 3 Based on Example 2, such as Figure 2 As shown, the folding platform 3 includes a folding platform frame 27 and a patterned plate 23; as Figure 6As shown, the folding platform frame 27 includes a folding frame, longitudinal beams 11, and a lower crossbeam 8; the lower crossbeam 8 is provided on the outer side of the folding frame; the longitudinal beam 11 is provided at the center of the lower part of the folding frame, and the longitudinal beam 11 is connected to the folding frame; as shown... Figure 5 As shown, the main platform 5 includes a main platform frame 24 and a patterned plate 23; the main platform frame 24 includes a main frame and a longitudinal beam 11; a longitudinal beam 11 is provided at the lower center of the main frame and is connected to the main frame; the patterned plate is installed on the upper surface of the main platform frame 24 and the folding platform frame 27; the folding frame is connected to the main frame by multiple heavy-duty hinges 12; both the main frame and the folding frame are rectangular structures welded from metal materials.

[0043] like Figure 9 and Figure 10 As shown, the heavy-duty hinge 12 includes a first hinge seat 34 and a second hinge seat 35; the first hinge seat 34 and the second hinge seat 35 are connected by a first pin 38, and both the first hinge seat 34 and the second hinge seat 35 can rotate around the first pin 38; a hinge pad 36 is respectively provided above the first hinge seat 34 and the second hinge seat 35; the hinge pad 36 above the first hinge seat 34 is connected to the first hinge seat 34 by an internal hex screw; the hinge pad 36 above the second hinge seat 35 is connected to the second hinge seat 35 by an internal hex screw; on the main body platform 5, the first hinge seat 34 is in contact with the bottom of the main body platform 5, and then connected by the hinge pad Plate 36 is fixed to the main platform 5; the second hinge seat 35 on the folding platform 3 is attached to the bottom of the folding platform 3, and then fixed to the folding platform 3 by the hinge pad 36; the first hinge seat 34 and the second hinge seat 35 are connected by the first pin 38; the hinge pad 36 is fixed to the folding platform 3 and the main platform 5 by means of the second nut 37, flat washer and internal hex screw. This fixing method is a conventional method in the mechanical field. Those skilled in the art can achieve the fixed connection between the hinge pad 36 and the folding platform 3 and the main platform 5 without creative effort based on these components, which will not be described in detail here.

[0044] like Figure 1 and Figure 6As shown, an industrial socket 7 for supplying power to the electric push rod 10 is provided on the side of the lower crossbeam 8; the industrial socket 7 is connected to the electrical cabinet 39 via wires, and the electrical cabinet 39 is connected to the electric push rod 10 via wires; the electrical cabinet 39 is fixedly installed below the main platform 5; the electric push rod 10 is installed below the platform; one end of the electric push rod 10 is connected to the electric push rod connector 9, and the other end of the electric push rod 10 is connected to the longitudinal beam 11 of the main platform 5; the electric push rod connector 9 is located at the bottom of the folding platform 3; the electrical cabinet 39 is a conventional electrical device in the art, and can be installed on this platform by purchasing a ready-made electrical cabinet 39 from the market. The electrical cabinet 39 is not an innovative content of this application, and it is also a mature prior art in the art. The relevant structure and function of the electrical cabinet 39 will not be described in detail here.

[0045] like Figure 3 As shown, the upper surface of the main platform 5 is provided with four lifting rings 4; the lifting rings 4 are made of round steel 13 bent into shape; the lifting rings 4 are connected to the bolt holes opened on the upper surface of the main platform 5; the bottom of the lower crossbeam 8 is provided with multiple walking wheels 6 to facilitate the overall movement of the platform; the patterned plates 23 of the folding platform 3 and the main platform 5 are both aluminum alloy patterned plates 23 that are easy for people to walk on.

[0046] like Figure 4 As shown, the railing 1 includes a handrail 19 and a fixed structure; the handrail 19 is connected to the fixed structure, and the fixed structure is fixedly installed on the platform; the handrail 19 is laid flat on the platform or fixed vertically on the platform through the fixed structure; the fixed structure includes a kick plate 18 and two handrail bases 20; the two handrail bases 20 are fixedly installed on the platform, and the two ends of the kick plate 18 are respectively connected to the two handrail bases 20; the bottom ends of the railing 1 are respectively connected to the two handrail bases 20 through a second pin 17; the two handrail bases 20 are also provided with quick-release pins 16 that can pass through the handrail bases 20 and the handrail 19; the second pin 17 is also provided with a cotter pin 21 to prevent the second pin 17 from being pulled out. The purpose of providing the cotter pin 21 is to facilitate the rotation of the railing 1 around the pin 17 and to prevent the second pin 17 from being pulled out, thereby avoiding the safety risks caused by the instability of the handrail 19.

[0047] Example 4 Based on Embodiment 3, the working principle of this utility model is as follows: S1: The railing 1 of the inspection and maintenance platform is in a flat position and the industrial power supply plug is plugged in; S2: Lift the maintenance platform from the storage location using the lifting ring 4, operate the electrical cabinet 39 that is equipped with the maintenance platform to supply power to the electric push rod 10 so that the electric push rod 10 retracts. When the folding platform 3 is folded into place, unplug the power supply plug and start lowering the maintenance platform. S3: After the maintenance platform is lowered to the appropriate position, insert the power connector again to extend the electric push rod 10 and adjust the platform to the unfolded state; S4: Continue to lower the platform until it is on the corresponding flat surface, ensuring that the casters 30 are in safe contact with the surface. S5: Push the platform close to the locking beam of the hydropower gate lever, step on the brake pedal of the traveling wheel 6, and fix the platform; S6: Remove one side of the tension spring 26 at the hook of the fall arrestor 2 and pull the pin on the door latch out of the door latch hole 32 of the telescopic rod 33, and then pull out the fall arrestor bracket 29; when the fall arrestor bracket 29 is fully pulled out and fixed by the telescopic sleeve, at this time the other door latch hole 32 on the telescopic rod 33 is directly below the door latch, insert the pin of the door latch into the door latch hole 32 again to fix the telescopic rod 33, and check whether the fall arrestor net 28 is covered correctly; S7: Pull out the quick-release pin 16, raise the handrail 19, and insert the quick-release pin 16 into the other hole to lock the handrail 19; S8: After use, the maintenance platform shall be recycled; S9: Pull out the quick-release pin 16, lay the armrest 19 flat, and insert the quick-release pin 16 into the other hole to lock the armrest 19; S10: After pushing the fall arrestor bracket 29 back into place, hook the tension spring 26 back onto the hook on the fall arrestor bracket 29, and insert the door bolt into the door bolt hole 32 that was previously pulled out to fix the fall arrestor device 2. S11: Lift the brake pedal of the traveling wheel 6 to allow the platform to move freely and push the platform away from the water and electricity gate lever locking beam; S12: Plug in the industrial power supply plug, lift the maintenance platform to a certain height using the lifting ring 4, operate the electrical cabinet 39 of the maintenance platform to supply power to retract the electric push rod 10, adjust the platform to a folded state, and after folding it in place, unplug the power supply plug.

[0048] S13: Lift the maintenance platform out and place it above the storage area.

[0049] S14: Insert the power supply connector, operate the electrical cabinet 39 of the maintenance platform to extend the electric push rod 10, and adjust the platform to the unfolded state for storage. The purpose of adjusting to unfolded storage here is to facilitate the maintenance personnel to observe and maintain the maintenance platform. If it is folded for storage, the platform will be too tall, which is not conducive to the maintenance personnel's observation and maintenance.

[0050] The above description is a detailed description of the preferred embodiments of this application. However, the embodiments are not intended to limit the scope of the patent application of this application. All equivalent changes or modifications made under the technical spirit of this application should fall within the patent scope covered by this application.

Claims

1. A maintenance platform with orifice sealing function, characterized in that: The system includes a platform, a railing (1), and a fall arrestor (2); the platform and the fall arrestor (2) are connected, and the railing (1) is set on the platform near the fall arrestor (2); the fall arrestor (2) includes a fall arrestor net (28), which is connected to the platform; fall arrestor brackets (29) supporting the fall arrestor net (28) are provided on both sides below the fall arrestor net (28); the bottom of the fall arrestor brackets (29) is provided with casters (30) to facilitate the fall arrestor net (28) to be retracted and / or unfolded; the fall arrestor net (28) is connected to the fall arrestor brackets (29); the telescopic rod (33) of the fall arrestor brackets (29) is connected to the inner cavity opened inside the platform, and the telescopic rod (33) reciprocates in the inner cavity of the platform.

2. The maintenance platform with orifice sealing function according to claim 1, characterized in that: The platform is provided with multiple anti-fall net fixing rings (22) on the side near the anti-fall device (2), and the anti-fall net (28) is connected to the multiple anti-fall net fixing rings (22); the platform includes a folding platform (3) and a main platform (5); the two sides of the main platform (5) are connected to the folding platform (3) through multiple heavy-duty hinges (12), and the folding platform (3) is folded downward and / or unfolded outward through multiple heavy-duty hinges (12).

3. The maintenance platform with orifice sealing function according to claim 2, characterized in that: The fall arrestor (29) is provided with a tension spring hook (31) for fixing the fall arrestor net (28) to the platform; the fall arrestor net (28) is tied to the fall arrestor (29) by a rope knot; a tension spring (26) is provided on the outside of the folding platform (3), and the tension spring (26) is connected to the tension spring hook (31).

4. The maintenance platform with orifice sealing function according to claim 2, characterized in that: The inner cavity is located inside the folding platform (3) near one end of the fall arrestor (2); the inner cavity is provided with a telescopic rod sleeve (25) to prevent the telescopic rod (33) from being fully pulled out; the telescopic rod (33) extends and retracts inside the telescopic sleeve; the end of the telescopic rod (33) is provided with a circular piece with a diameter larger than the inner diameter of the telescopic sleeve.

5. A maintenance platform with orifice sealing function according to claim 4, characterized in that: The telescopic rod (33) has door latch holes (32) at both ends along its length to facilitate fixing the telescopic rod (33); the folding platform (3) has a door latch at one end near the fall arrestor (2); the door latch is located above the inner cavity of the folding platform (3).

6. The maintenance platform with orifice sealing function according to claim 5, characterized in that: The folding platform (3) includes a folding platform frame (27) and a patterned plate (23); the folding platform frame (27) includes a folding frame, a longitudinal beam (11) and a lower crossbeam (8); the lower crossbeam (8) is provided on the outer side of the folding frame; a longitudinal beam (11) is provided at the center of the lower part of the folding frame and is connected to the folding frame; the main platform (5) includes a main platform frame (24) and a patterned plate (23); the main platform frame (24) includes a main frame and a longitudinal beam (11); a longitudinal beam (11) is provided at the center of the lower part of the main frame and is connected to the main frame; the patterned plate (23) is installed on the upper surface of the main platform frame (24) and the folding platform frame (27); the folding frame and the main frame are connected by multiple heavy-duty hinges (12).

7. A maintenance platform with orifice sealing function according to claim 6, characterized in that: The heavy-duty hinge (12) includes a first hinge seat (34) and a second hinge seat (35); the first hinge seat (34) and the second hinge seat (35) are connected by a first pin (38), and both the first hinge seat (34) and the second hinge seat (35) can rotate around the first pin (38); a hinge pad (36) is respectively provided above the first hinge seat (34) and the second hinge seat (35); the hinge pad (36) above the first hinge seat (34) is connected to the first hinge seat (34) by an internal hex screw; the hinge pad (36) above the second hinge seat (35) is connected to the second hinge seat (35) by an internal hex screw.

8. A maintenance platform with orifice sealing function according to claim 6, characterized in that: An industrial socket (7) for powering an electric push rod (10) is provided on the side of the lower crossbeam (8); the industrial socket (7) is connected to the electrical cabinet (39) by wires, and the electrical cabinet (39) is connected to the electric push rod (10) by wires; the electrical cabinet (39) is fixedly installed below the main platform (5); an electric push rod (10) is provided below the platform; one end of the electric push rod (10) is connected to the electric push rod connector (9), and the other end of the electric push rod (10) is connected to the longitudinal beam (11) of the main platform (5); the electric push rod connector (9) is located at the bottom of the folding platform (3).

9. A maintenance platform with orifice sealing function according to claim 8, characterized in that: The upper surface of the main platform (5) is provided with four lifting rings (4); the lifting rings (4) are made of round steel (13) bent; the lifting rings (4) are connected to bolt holes opened on the upper surface of the main platform (5); the bottom of the lower crossbeam (8) is provided with multiple walking wheels (6) to facilitate the overall movement of the platform; the patterned plates (23) of the folding platform (3) and the main platform (5) are both aluminum alloy patterned plates (23) to facilitate human walking.

10. A maintenance platform with orifice sealing function according to claim 1, characterized in that: The railing (1) includes a handrail (19) and a fixed structure; the handrail (19) is connected to the fixed structure, and the fixed structure is fixedly installed on the platform; the handrail (19) is laid flat on the platform or fixed vertically on the platform through the fixed structure; the fixed structure includes a kick plate (18) and two handrail bases (20); the two handrail bases (20) are fixedly installed on the platform, and the two ends of the kick plate (18) are respectively connected to the two handrail bases (20); the bottom ends of the railing (1) are respectively connected to the two handrail bases (20) through a second pin (17); the two handrail bases (20) are also provided with quick-release pins (16) that can pass through the handrail bases (20) and the handrail (19); the second pin (17) is also provided with a cotter pin (21) to prevent the second pin (17) from being pulled out.

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