A tunnel fan maintenance platform

Abstract

The present invention relates to a tunnel fan maintenance platform, which relates to the field of tunnel maintenance technology and is used to solve the problem in the prior art that a large number of auxiliary equipment needs to be equipped during the tunnel fan maintenance process, the operation is difficult, and the passage of vehicles in the tunnel is easily affected; the platform comprises: a lifting mechanism, an extension mechanism and a guardrail, the lifting mechanism comprises a lifting frame, a lifting platform, a first drive assembly and a second drive assembly, the lifting frame is controlled to be vertically lifted and lowered on the carrier vehicle by the first drive assembly; the lifting platform is controlled to be vertically lifted and lowered on the lifting frame by the second drive assembly; the extension mechanism comprises an extension platform and a horizontal drive assembly, the extension platform and the lifting platform are slidably matched, the extension platform is driven to move on the lifting platform by the horizontal drive assembly, the lifting platform and the extension platform are combined to form an operating platform; the guardrail is provided on the edge of the operating platform.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel maintenance, and in particular to a tunnel fan maintenance platform. Background Art

[0002] With the rapid development of the domestic transportation industry, the number of tunnels has increased year by year. The ancillary facilities in old tunnels need to be regularly inspected and replaced, especially the fans in the tunnels. As the operating years of the tunnels increase, the service life of the fans decreases year by year, and the ventilation efficiency will not be able to meet the requirements, and they need to be regularly inspected and replaced.

[0003] The fan is installed in the middle of the tunnel vault. When dismantling the fan, the construction position is directly below the fan. When dismantling the tunnel fan, a support platform needs to be provided to facilitate the construction workers to replace the fan. At the same time, lifting equipment is required to lift the new fan onto the support platform and lift the replaced old fan onto the carrier vehicle; this will lead to the following problems: 1. Manual scaffolding is required, which is difficult to move, with low construction efficiency and high safety risks; 2. The fan replacement process requires not only lifting equipment and support platform shipping equipment but also a fan carrier vehicle; 3. The fixed work platform will affect the passage of other construction vehicles in the tunnel during shipping. Summary of the Invention

[0004] In response to the defects in the existing technology, the present invention provides a tunnel fan maintenance platform, which is used to solve the problems in the existing technology that the tunnel fan maintenance process requires a large number of auxiliary equipment, is difficult to operate, and easily affects the passage of vehicles in the tunnel.

[0005] To achieve the above-mentioned object, the present invention provides a tunnel fan maintenance platform, comprising: a lifting mechanism, an extension mechanism, and a guardrail. The lifting mechanism comprises a lifting frame, a lifting platform, a first drive assembly, and a second drive assembly. The lifting frame is controlled to be vertically raised and lowered on a carrier vehicle by the first drive assembly; the lifting platform is controlled to be vertically raised and lowered on the lifting frame by the second drive assembly.

[0006] The extension mechanism includes an extension platform and a horizontal drive component. The extension platform and the lifting platform are slidably matched. The extension platform is driven by the horizontal drive component to move on the lifting platform. The lifting platform and the extension platform are combined to form an operating platform; the guardrail is provided on the edge of the operating platform.

[0007] The operating platform is mounted on the transport vehicle and can be driven to the location requiring maintenance by the transport vehicle, eliminating the need for on-site platform construction and saving time and effort. The first drive assembly controls the vertical elevation of the lifting frame on the transport vehicle, while the second drive assembly controls the vertical elevation of the lifting platform on the lifting frame. This allows the lifting platform and the cargo carried thereon to be raised from the transport vehicle bed to a desired height. Once the lifting platform reaches the desired height, the extension platform can be extended, increasing the overall operating space and facilitating maintenance and replacement of the fan. Furthermore, since the fan is located directly above the tunnel and the transport vehicle is in the right lane, the extension platform, driven by the horizontal drive assembly, can be extended toward the center of the tunnel. This allows maintenance and replacement of the fan without affecting the normal operation of the left lane.

[0008] Optionally, the first drive assembly includes a first telescopic member fixedly mounted on the carrier vehicle, with a telescopic end of the first telescopic member fixedly connected to the lifting frame. The first telescopic member may be an oil cylinder, a pneumatic cylinder, or an electric push rod, and the lifting frame and the lifting platform connected thereto are driven to perform linear motion in a vertical direction via the first telescopic member.

[0009] Optionally, the first driving assembly further includes a guide column, one end of which is fixedly mounted on the carrier vehicle, the guide column is vertically arranged, and several of the guide columns are respectively slidably engaged with the columns of the lifting frame, and the first telescopic member is arranged inside the guide column to save space. The lifting frame moves along the guide column to ensure that the lifting frame does not shake during the lifting process and can achieve smooth lifting.

[0010] Optionally, the second drive assembly includes a first rotary drive member, a driving gear, a rack and a guide rod. The first rotary drive member can be a hydraulic motor, a pneumatic motor or an electric motor. The guide rod is fixedly connected to the lifting frame, the lifting platform and the guide rod are slidably matched, the rack is fixedly connected to the lifting frame, the rack and the guide rod are arc-shaped and parallel, the first rotary drive member is fixedly connected to the lifting platform, the driving gear and the output end of the first rotary drive member are coaxially fixedly connected, and the driving gear and the rack are meshed with each other.

[0011] The driving gear is driven to rotate by the first rotating drive member. Since the driving gear is engaged with the rack, the driving gear will perform linear motion along the rack during rotation. At least two sets of the second driving components are provided on the lifting platform.

[0012] Optionally, the horizontal drive assembly includes a second telescopic member, which can be an oil cylinder, a pneumatic cylinder or an electric push rod. The second telescopic member is fixed on the lifting platform, and a slide groove is provided on the lifting platform. The extension platform and the slide groove are slidably matched, and the extension platform can be extended to the left side of the carrier vehicle. The telescopic end of the second telescopic member is fixedly connected to the extension platform, and the extension platform is driven to move along the slide groove by the second telescopic member.

[0013] Optionally, the lifting platform is provided with a transverse chute and a longitudinal chute, the longitudinal chute is provided along the forward direction of the transport vehicle, and the transverse chute and the longitudinal chute are perpendicular to each other;

[0014] The extension platform includes a first platform, a second platform, and a third platform. The first platform is in sliding engagement with the transverse slide groove, while the second and third platforms are in sliding engagement with the longitudinal slide groove. The first platform is used to extend the operating platform to the left side of the vehicle, while the second and third platforms are used to extend the operating platform forward and backward.

[0015] Optionally, the horizontal drive assembly includes a second rotary drive member, a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear, a fifth bevel gear, a first screw rod, a second screw rod and a third screw rod;

[0016] The second rotary drive member is fixedly connected to the lifting platform. The second rotary drive member can be a hydraulic motor, a pneumatic motor or an electric motor. The fourth bevel gear and the second rotary drive member are coaxially fixedly connected. The fifth bevel gear is rotatably connected to the lifting platform. The first screw rod and the first bevel gear are coaxially fixedly connected. The second screw rod and the second bevel gear are coaxially fixedly connected. The third screw rod and the third bevel gear are coaxially fixedly connected. The first screw rod, the second screw rod and the third screw rod are all rotatably connected to the lifting platform. The first screw rod and the first platform are threaded together, the second screw rod and the second platform are threaded together, and the third screw rod and the third platform are threaded together. The first bevel gear, the second bevel gear, the third bevel gear and the fourth bevel gear are all meshed with the fifth bevel gear.

[0017] The fourth bevel gear is driven to rotate by the second rotating drive member, the fourth bevel gear drives the fifth bevel gear to rotate, the fifth bevel gear drives the first bevel gear, the second bevel gear, and the third bevel gear to rotate, the first bevel gear drives the first screw to rotate, and during the rotation of the first screw, the first platform is driven to move along the transverse slot, the second bevel gear drives the second screw to rotate, and during the rotation of the second screw, the second platform is driven to move along the longitudinal slot, the third bevel gear drives the third screw to rotate, and during the rotation of the third screw, the third platform is driven to move along the longitudinal slot. Using only one power source, the three platforms can be driven to move in three directions simultaneously, and the three platforms can be extended synchronously with good coordination.

[0018] Optionally, the guardrail includes a fixed guardrail and a telescopic guardrail, one end of the telescopic guardrail being connected to the lifting platform, and the other end of the telescopic guardrail being connected to the extension platform. The lifting platform and the extension platform are both fixedly mounted with fixed guardrails, and the telescopic guardrail and the fixed guardrail form a closed loop. The extension of the extension platform drives the telescopic guardrail to extend and retract, ensuring that the entire platform is always surrounded by guardrails during the extension process, thereby enhancing safety during construction on the operating platform.

[0019] Optionally, the telescopic guardrail includes a plurality of rods, and the plurality of rods are connected in a scissor-type staggered rotation manner, which has a simple structure and is easy to install.

[0020] Optionally, the tunnel fan maintenance platform further comprises a plurality of oblique telescopic parts, which may be air cylinders, oil cylinders or electric push rods; the oblique telescopic parts are hinged on the carrier vehicle, and the telescopic ends of the oblique telescopic parts are hinged to the lifting frame, and the oblique telescopic parts support the operating platform, and at the same time, the oblique telescopic parts serve as auxiliary driving during the lifting process of the lifting platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the tunnel fan maintenance platform according to an embodiment of the present invention when it is in working state;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the tunnel fan maintenance platform of an embodiment of the present invention when the carriage body is removed;

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the tunnel fan maintenance platform in an embodiment of the present invention when the platform is in the lowest position;

[0024] Figure 4 This is a left view of the tunnel fan maintenance platform in an embodiment of the present invention;

[0025] Figure 5 For the embodiment of the present invention Figure 1 A magnified view of the middle part A;

[0026] Figure 6 For the embodiment of the present invention Figure 2 Enlarged view of the middle part B;

[0027] Figure 7 For the embodiment of the present invention Figure 2 A magnified view of the middle part C;

[0028] Figure 8 For the embodiment of the present invention Figure 4 The cross-section along the FF direction;

[0029] Figure 9 For the embodiment of the present invention Figure 8 Enlarged view of part D in the middle. DETAILED DESCRIPTION

[0030] Specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described herein are for illustrative purposes only and are not intended to limit the present invention. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that these specific details are not necessarily required to practice the present invention. In other instances, well-known circuits, software, or methods are not specifically described to avoid obscuring the present invention.

[0031] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "in one embodiment," "in an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combinations and / or subcombinations in one or more embodiments or examples. Furthermore, those of ordinary skill in the art will appreciate that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0032] See also Figures 1-9The present invention provides an embodiment of a tunnel fan maintenance platform, comprising: a lifting mechanism, an extension mechanism, and a guardrail 8. The lifting mechanism includes a lifting frame 2, a lifting platform 3, a first drive assembly 4, and a second drive assembly 5. The first drive assembly 4 controls the vertical lifting of the lifting frame 2 on a carrier 1; the second drive assembly 5 controls the vertical lifting of the lifting platform 3 on the lifting frame 2. The carrier 1 is provided with telescopic legs 10 at the bottom. During operation, the telescopic legs 10 extend from both sides of the carrier to provide support for the carrier 1 and ensure stability. The operating platform can be normally retracted into the box 11 of the vehicle. During operation, the operating platform rises to the top of the box 11.

[0033] The extension mechanism includes an extension platform 6 and a horizontal drive component 7. The extension platform 6 and the lifting platform 3 are slidably matched. The extension platform 6 is driven to move on the lifting platform 3 by the horizontal drive component 7. The lifting platform 3 and the extension platform 6 are combined to form an operating platform; the guardrail 8 is provided on the edge of the operating platform.

[0034] The operating platform is mounted on the carrier vehicle 1 and is driven with the carrier vehicle 1 to the location requiring maintenance. This eliminates the need for on-site platform construction, saving time and effort. The first drive assembly 4 controls the vertical elevation of the lifting frame 2 on the carrier vehicle 1, while the second drive assembly 5 controls the vertical elevation of the lifting platform 3 on the lifting frame 2. This allows the lifting platform 3 and the cargo carried thereon to be raised from the vehicle compartment of the carrier vehicle 1 to a desired height. After the lifting platform 3 has reached the desired height, the extension platform 6 can be extended, increasing the space available on the entire operating platform and facilitating maintenance and replacement of the fan. Furthermore, since the fan is located directly above the tunnel and the carrier vehicle 1 is in the right lane, the extension platform 6 can be extended toward the center of the tunnel under the drive of the horizontal drive assembly 7. This allows the normal operation of the left lane to be maintained and replaced without affecting the operation of the left lane.

[0035] In this embodiment, please refer to Figure 1 、 Figure 2 and Figure 6 The first drive assembly 4 includes a first telescopic member 402, which is fixedly mounted on the carrier 1. The telescopic end of the first telescopic member 402 is fixedly connected to the lifting frame 2. The first telescopic member 402 can be a cylinder, a pneumatic cylinder, or an electric push rod, and drives the lifting frame 2 and the lifting platform 3 connected thereto to perform linear motion in the vertical direction.

[0036] In this embodiment, please refer to Figure 1 、 Figure 2 and Figure 6The first drive assembly 4 further includes a guide post 401, one end of which is fixedly mounted on the carrier 1. The guide post 401 is vertically arranged, and a plurality of guide posts 401 are slidably engaged with the upright posts 201 of the lifting frame 2. The first telescopic member 402 is disposed within the guide post 401 to save space. The lifting frame 2 moves along the guide post 401, ensuring that the lifting frame 2 does not shake during the lifting process, and can achieve smooth lifting.

[0037] In this embodiment, please refer to Figure 1 and Figure 5 The second drive assembly 5 includes a first rotary drive member 501, a driving gear 502, a rack 503 and a guide rod 504. The first rotary drive member 501 can be a hydraulic motor, a pneumatic motor or an electric motor. The guide rod 504 is fixedly connected to the lifting frame 2, and the lifting platform 3 and the guide rod 504 are slidably matched. The rack 503 is fixedly connected to the lifting frame 2, and the rack 503 and the guide rod 504 are arc-shaped and parallel. The first rotary drive member 501 is fixedly connected to the lifting platform 3, and the driving gear 502 is coaxially fixedly connected to the output end of the first rotary drive member 501. The driving gear 502 and the rack 503 are meshed with each other.

[0038] The driving gear 502 is driven to rotate by the first rotating driving member 501. Since the driving gear 502 is engaged with the rack 503, the driving gear 502 will perform linear motion along the rack 503 during rotation. At least two groups of the second driving components 5 are provided on the lifting platform 3.

[0039] In this embodiment, please refer to Figure 1 and Figure 8 The horizontal drive assembly 7 includes a second telescopic member, which can be an oil cylinder, an air cylinder or an electric push rod. The second telescopic member is fixed on the lifting platform 3. A slide groove is provided on the lifting platform 3. The extension platform 6 slides with the slide groove. The extension platform 6 can be extended to the left side of the carrier 1. The telescopic end of the second telescopic member is fixedly connected to the extension platform 6, and the extension platform 6 is driven to move along the slide groove by the second telescopic member.

[0040] In this embodiment, please refer to Figure 1 、 Figure 2 and Figure 8 , the lifting platform 3 is provided with a transverse chute and a longitudinal chute, the longitudinal chute is arranged along the forward direction of the carrier 1, and the transverse chute and the longitudinal chute are perpendicular to each other;

[0041] The extension platform 6 includes a first platform 601, a second platform 602, and a third platform 603. The first platform 601 slides in engagement with the transverse chute, while the second platform 602 and the third platform 603 slide in engagement with the longitudinal chute. The first platform 601 extends the operating platform to the left of the vehicle 1, while the second platform 602 and the third platform 603 extend the operating platform forward and backward.

[0042] In this embodiment, please refer to Figure 1 、 Figure 2 、 Figure 8 and Figure 9 The horizontal drive assembly 7 includes a second rotary drive member 701, a first bevel gear 704, a second bevel gear 705, a third bevel gear 706, a fourth bevel gear 702, a fifth bevel gear 703, a first screw rod 707, a second screw rod 708 and a third screw rod 709;

[0043] The second rotary drive member 701 is fixedly connected to the lifting platform 3. The second rotary drive member 701 can be a hydraulic motor, a pneumatic motor or an electric motor. The fourth bevel gear 702 and the second rotary drive member 701 are coaxially fixedly connected. The fifth bevel gear 703 is rotatably connected to the lifting platform 3. The first screw rod 707 and the first bevel gear 704 are coaxially fixedly connected. The second screw rod 708 and the second bevel gear 705 are coaxially fixedly connected. The third screw rod 709 and the third bevel gear 706 are coaxially fixedly connected. The first screw rod 707, the second screw rod 708, and the third screw rod 709 are all rotatably connected to the lifting platform 3. The first screw rod 707 is threadedly engaged with the first platform 601, the second screw rod 708 is threadedly engaged with the second platform 602, and the third screw rod 709 is threadedly engaged with the third platform 603. The first bevel gear 704, the second bevel gear 705, the third bevel gear 706 and the fourth bevel gear 702 are all engaged with the fifth bevel gear 703.

[0044] The fourth bevel gear 702 is driven to rotate by the second rotating drive member 701, and the fourth bevel gear 702 drives the fifth bevel gear 703 to rotate. The fifth bevel gear 703 drives the first bevel gear 704, the second bevel gear 705, and the third bevel gear 706 to rotate. The first bevel gear 704 drives the first screw rod 707 to rotate. During the rotation of the first screw rod 707, the first platform 601 is driven to move along the transverse chute. The second bevel gear 705 drives the second screw rod 708 to rotate. During the rotation of the second screw rod 708, the second platform 602 is driven to move along the longitudinal chute. The third bevel gear 706 drives the third screw rod 709 to rotate. During the rotation of the third screw rod 709, the third platform 603 is driven to move along the longitudinal chute. Using only one power source, the three platforms can be driven to move in three directions at the same time, and the extension process of the three platforms is well coordinated.

[0045] In this embodiment, please refer to Figure 1-Figure 7 The guardrail 8 includes a fixed guardrail 801 and a telescopic guardrail 802. One end of the telescopic guardrail 802 is connected to the lifting platform 3, and the other end of the telescopic guardrail 802 is connected to the extension platform 6. The fixed guardrail 801 is fixedly installed on both the lifting platform 3 and the extension platform 6. The telescopic guardrail 802 and the fixed guardrail 801 form a closed loop space. During the extension process of the extension platform 6, the telescopic guardrail 802 is driven to extend and retract, ensuring that there are guardrails around the operating platform at all times during the extension process of the entire platform, making construction on the operating platform safer. The fixed guardrail 801 on the third platform 603 is a detachable structure. When the lifting platform 3 is at the bottom of the carriage, the fixed guardrail 801 on the third platform 603 can be removed to facilitate the up and down movement of the fan and personnel. When the lifting platform 3 is about to rise, the fixed guardrail 801 can be installed.

[0046] In this embodiment, please refer to Figure 7 The telescopic guardrail 802 includes a plurality of rods 8021, and the plurality of rods 8021 are connected in a scissor-type staggered rotation manner, which has a simple structure and is easy to install.

[0047] In this embodiment, please refer to Figure 1-Figure 3 The tunnel fan maintenance platform also includes several oblique telescopic parts 9, which can be air cylinders, oil cylinders or electric push rods; the oblique telescopic parts 9 are hinged on the carrier 1, and the telescopic ends of the oblique telescopic parts 9 are hinged to the lifting frame 2. The oblique telescopic parts 9 support the operating platform, and at the same time, the oblique telescopic parts 9 play an auxiliary driving role during the lifting process of the lifting platform 3.

[0048] In this embodiment, please refer to Figure 1 and Figure 2 The carrier vehicle 1 is provided with a hydraulic pump and a control system 12, and the movement of the maintenance platform is controlled by the hydraulic system, which has strong power and strong carrying capacity.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A tunnel fan maintenance platform, characterized in that: include: Lifting mechanism, The lifting mechanism includes a lifting frame, a lifting platform, a first drive assembly and a second drive assembly, wherein the lifting frame is controlled to be vertically raised and lowered on the carrier by the first drive assembly, and the lifting platform is controlled to be vertically raised and lowered on the lifting frame by the second drive assembly; Extension agency, The extension mechanism includes an extension platform and a horizontal drive assembly. The extension platform and the lifting platform are slidably matched. The extension platform is driven by the horizontal drive assembly to move on the lifting platform. The lifting platform and the extension platform are combined to form an operating platform. guardrails, The edge of the operating platform is provided with the guardrail; The first drive assembly includes a first telescopic member, which is fixedly mounted on the carrier vehicle, and a telescopic end of the first telescopic member is fixedly connected to the lifting frame; the second drive assembly includes a first rotary drive member, a driving gear, a rack, and a guide rod, the guide rod is fixedly connected to the lifting frame, the lifting platform and the guide rod are slidably engaged, the rack is fixedly connected to the lifting frame, the rack and the guide rod are arc-shaped and parallel, the first rotary drive member is fixedly connected to the lifting platform, the driving gear and the output end of the first rotary drive member are coaxially fixedly connected, and the driving gear and the rack are meshed with each other; The lifting platform is provided with a transverse chute and a longitudinal chute, the longitudinal chute is arranged along the forward direction of the carrier vehicle, and the transverse chute and the longitudinal chute are perpendicular to each other; The extension platform includes a first platform, a second platform and a third platform, the first platform is in sliding cooperation with the transverse slide groove, and the second platform and the third platform are both in sliding cooperation with the longitudinal slide groove; The horizontal drive assembly includes a second rotary drive member, a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear, a fifth bevel gear, a first screw rod, a second screw rod and a third screw rod; The second rotating drive member is fixedly connected to the lifting platform, the fourth bevel gear and the second rotating drive member are coaxially fixedly connected, the fifth bevel gear is rotatably connected to the lifting platform, the first screw rod and the first bevel gear are coaxially fixedly connected, the second screw rod and the second bevel gear are coaxially fixedly connected, the third screw rod and the third bevel gear are coaxially fixedly connected, the first screw rod, the second screw rod and the third screw rod are all rotatably connected to the lifting platform, the first screw rod and the first platform are threadedly matched, the second screw rod and the second platform are threadedly matched, the third screw rod and the third platform are threadedly matched, the first bevel gear, the second bevel gear, the third bevel gear and the fourth bevel gear are all meshed with the fifth bevel gear.

2. The tunnel fan maintenance platform according to claim 1 is characterized in that: The first driving assembly further includes a guide column, one end of which is fixedly mounted on the carrier vehicle, the guide column being vertically arranged, a plurality of the guide columns respectively slidingly cooperating with the columns of the lifting frame, and the first telescopic member being arranged inside the guide column.

3. The tunnel fan maintenance platform according to claim 1 is characterized in that: The horizontal drive assembly includes a second telescopic member, which is fixed on the lifting platform. A slide groove is provided on the lifting platform. The extension platform and the slide groove are slidably matched. The telescopic end of the second telescopic member is fixedly connected to the extension platform.

4. The tunnel fan maintenance platform according to claim 1 is characterized in that: The guardrail includes a fixed guardrail and a telescopic guardrail. One end of the telescopic guardrail is connected to the lifting platform, and the other end of the telescopic guardrail is connected to the extension platform. Fixed guardrails are fixedly installed on the lifting platform and the extension platform. The telescopic guardrail and the fixed guardrail form a closed-loop space.

5. The tunnel fan maintenance platform according to claim 4 is characterized in that: The telescopic guardrail includes a plurality of rods, and the plurality of rods are connected in a scissor-type staggered rotation.

6. The tunnel fan maintenance platform according to claim 1, characterized in that: It also includes a plurality of oblique telescopic members, which are hinged on the carrier vehicle, and the telescopic ends of the oblique telescopic members are hinged to the lifting frame.

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