A convenient disassembly and assembly device for a self-sealing manhole cover and a method of using the same

Abstract

The present invention relates to a convenient disassembly and assembly device for a self-sealing manhole cover and a method for using the same, comprising an outer hole door, a guide rod inserted into a through hole on the outer wall of the outer hole door, one end of the guide rod being threadedly connected to the outer end face of the manhole cover, and the other end extending out of the outer hole door, a linear drive device being connected to the outer wall of the outer hole door, the output end of the linear drive device being connected to each guide through a connector, driving each guide rod to extend and retract axially, thereby driving the manhole cover to slide within the manhole boss; the outer hole door being hinged to the left or right side of the manhole boss by a hinge, the hinge shaft of the hinge being vertically arranged, and the side of the outer hole door away from the hinge being locked to the manhole boss; a groove being provided at one end of the outer hole door facing the manhole cover, the depth of the groove being not less than the thickness of the manhole cover. The present invention solves the technical problems that the existing disassembly and assembly device cannot smoothly disassemble and assemble the manhole cover, and the manhole cover is unconstrained after being disassembled, which is prone to collision and causes damage to the equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of simple assembly or disassembly equipment for metal parts, and particularly relates to a convenient disassembly device for a self-sealing manhole cover and a use method thereof. Background Art

[0002] High-pressure and low-pressure heaters are essential components of thermal power plant equipment. These heaters often have manholes, allowing maintenance personnel to access the pressure vessel for maintenance and cleaning. The manholes must be sealed for normal pressure vessel operation. A four-ring self-sealing manhole cover is a commonly used, reliable sealing structure for high-pressure vessels. This structure consists of a tubular manhole boss connected to the vessel sidewall, a manhole cover positioned within the manhole boss from the inside out, a sealing ring, a retaining ring, a four-ring, a check ring, and several screws. An anti-drop ring is also positioned within the four-ring to prevent it from falling off. While this structure is reliable, the process of installing and removing the manhole cover during maintenance is extremely complex. Furthermore, the manhole cover is heavy, requiring special equipment and coordinated lifting equipment to remove it. The entire disassembly process is time-consuming and labor-intensive, and poses significant safety risks. After vessel maintenance is complete, reassembling the manhole cover requires a reverse operation, making this self-sealing manhole cover highly uneconomical and unsafe for maintenance.

[0003] In order to solve the above technical problems, the invention patent with publication number CN220718336U discloses a disassembly and assembly device for a four-ring self-sealing manhole door, which uses a sliding mechanism to move the manhole door (equivalent to the manhole cover in this application) in the axial and horizontal directions to simplify the equipment used in the disassembly process and reduce the disassembly cost. However, it cannot solve the complex process and high cost during installation. During disassembly, the radial force of the manhole door is offset, causing the manhole door to get stuck when sliding out, increasing the difficulty of disassembly and easily causing damage to the inner wall of the manhole boss. The shaking of the manhole door caused by the suspension of the sliding mechanism poses a collision risk, posing a safety hazard to the equipment and operators. The position of the manhole door needs to be adjusted during installation, which increases the difficulty of installation. Therefore, such a disassembly and assembly device still has many shortcomings. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a convenient disassembly and assembly device for a self-sealing manhole cover, so as to solve the technical problems that the existing disassembly and assembly device cannot smoothly disassemble and assemble the manhole cover, and the manhole cover is unconstrained after being removed, which is prone to collision and causes damage to the equipment.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a self-sealing manhole cover convenient disassembly and assembly device, comprising an outer hole door hinged on the manhole boss, the outer wall of the outer hole door is provided with at least three through holes circumferentially evenly distributed with the central axis of the manhole boss as the center, a guide rod is inserted in each through hole, one end of the guide rod extends into the manhole boss and is threadedly connected to the outer end face of the manhole cover, and the other end extends out of the outer hole door, and a linear drive device coaxially arranged with the central axis of the manhole boss is also connected to the outer wall of the outer hole door, the output end of the linear drive device is connected to one end of each guide rod located outside the outer hole door through a connecting piece, driving each guide rod to extend and retract axially, driving the manhole cover to slide in the manhole boss; the outer hole door is hinged to the left or right side of the manhole boss by a hinge, the hinge shaft of the hinge is vertically arranged, and the end of the outer hole door away from the hinge is locked with the manhole boss; the end of the outer hole door facing the manhole cover is provided with a groove adapted to the manhole cover, and the depth of the groove is not less than the thickness of the manhole cover.

[0006] As a preferred solution, the connecting member includes a base and several connecting rods, the connecting rods correspond to the guide rods one by one, and the connecting rods are evenly distributed around the linear drive device. A connecting hole is opened at one end of the connecting rod and is sleeved on the corresponding guide rod to form a connecting part, and the other end of the connecting rod extends to the base and is connected to the base.

[0007] As a preferred solution, a support member for supporting each connecting rod is connected to the outer wall of the outer hole door, and a support surface corresponding to the connecting rod is provided on the support member, and each supporting surface is parallel to the central axis of the manhole boss. Each connecting rod is slidably attached to the corresponding supporting surface. The support member is the outer wall of the linear drive device or a cylinder sleeved on the periphery of the linear drive device or a "["-shaped bracket with one end connected to the outer hole door and the other end connected to the outer casing of the linear drive device.

[0008] As a preferred solution, support plates are connected between adjacent connecting rods.

[0009] As a preferred solution, threads are respectively provided at both ends of the guide rod, and one end of the guide rod extending out of the outer hole is connected to at least one nut, which is provided on the downstream side of the movement direction of the connecting part.

[0010] As a preferred solution, the linear drive device is a hydraulic push rod, the cylinder body of the hydraulic push rod is connected to the outer wall of the outer hole door, and the push rod end of the hydraulic push rod is connected to the connecting piece as an output end.

[0011] As a preferred solution, the linear drive device is detachably connected to the outer hole door, and the connecting piece is detachably connected to the output end of the linear drive device.

[0012] The second technical problem to be solved by the present invention is to provide a method for using a convenient disassembly and assembly device for a self-sealing manhole cover, so as to solve the technical problems that the existing disassembly and assembly devices are inconvenient to operate and have safety risks.

[0013] In order to solve the above technical problems, the technical solution adopted by the present invention is: based on the method of using the above-mentioned self-sealing manhole cover convenient disassembly and assembly device, it includes the following specific steps:

[0014] S1 initial installation process;

[0015] S11. Thread the manhole cover into the guide rods, then pass the outer hole door through the guide rods and sleeve it onto the manhole cover, so that the manhole cover is embedded in the groove;

[0016] S12, installing the linear drive device on the outer wall of the outer hole door, controlling the output end of the linear drive device to extend to a set position, and connecting the output end of the linear drive device to each guide rod using a connector;

[0017] S13. Lift the outer hole door and the manhole cover together to the mouth of the manhole boss, adjust the positions of the outer hole door and the manhole boss so that the manhole cover is aligned with the inner hole of the manhole boss, and connect the outer hole door and the manhole boss with a hinge;

[0018] S14, cover the outer hole door and lock it, control the output end of the linear drive device to retract, and the linear drive device drives each guide rod to move into the manhole boss through the connecting piece, and each guide rod pushes the manhole cover into the manhole boss;

[0019] S15. Remove the connectors, unscrew the guide rods from the manhole cover, open the outer door, and install the sealing ring, retaining ring, four-ring ring, and anti-slip ring into the manhole boss in sequence;

[0020] S16. Cover the outer door and lock it;

[0021] S2, maintenance process;

[0022] S21. Unlock and open the outer hole door; remove the anti-slip ring, four-ring, retaining ring, and sealing ring in sequence;

[0023] S22. Cover the outer hole door and lock it, insert guide rods into the through holes of the outer hole door, and thread each guide rod to the manhole cover. Install the connector, connect one end of the connector to each guide rod and lock it with a nut, and connect the other end to the output end of the linear drive device;

[0024] S22, controlling the output end of the linear drive device to extend, and the output end drives each guide rod to move outward through the connecting piece, and each guide rod drives the manhole cover to move outward until it is separated from the manhole boss and enters the groove on the outer hole door;

[0025] S23, unlock and open the outer hole door for maintenance;

[0026] S24. After the inspection is completed, repeat S14-16 to complete the inspection.

[0027] As a preferred solution, after completing S16 or S24, the linear drive device is removed, and when performing step S22, the linear drive device is installed on the outer hole door.

[0028] As a preferred solution, during step S21, after removing the sealing ring, an arc-shaped slider is filled into the annular groove for embedding the four-ring, so that the concave arc surface of the slider is flush with the inner surface of the manhole boss.

[0029] The beneficial effects of the present invention are as follows: the present invention provides an outer hole door and a linear drive device connected to the outer hole door, and utilizes the linear drive device to smoothly pull the manhole cover out of the manhole boss and embed it in the outer hole door through multiple guide rods. In this way, the manhole cover can be rotated to the side of the manhole boss by simply rotating the outer hole door, and the manhole boss is opened for the user to enter the container for maintenance. The manhole cover is restricted by the groove and the force of the linear drive device, and can be stably maintained on the outer hole door, effectively avoiding the shaking of the manhole cover and causing collision damage to equipment and operators, and improving the disassembly and assembly efficiency of the manhole cover.

[0030] The method of use described in the present invention only uses a lifting device during the initial installation process, and no longer requires a lifting device during the subsequent maintenance process, thereby simplifying the operational process of disassembling and assembling the device during the maintenance process and reducing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0032] Figure 1 It is a front view of the disassembly and assembly device of the present invention;

[0033] Figure 2 yes Figure 1 AA cross-sectional view;

[0034] Figure 3 Therefore Figure 2 Schematic diagram of the disassembled state of the manhole cover as the basis;

[0035] Figure 4 Schematic diagram of the connection structure between the connecting rod and the support plate of the connecting member described in Example 1;

[0036] Figures 1 to 4In: 1. Manhole boss; 2. External hole door; 3. Through hole; 4. Guide rod; 5. Manhole cover; 6. Linear drive device; 7. Output end; 8. Connector; 801. Base; 802. Connecting rod; 803. Connecting hole; 804. Connecting part; 9. Hinge; 901. Hinge shaft; 10. Groove; 11. Support member; 12. Support surface; 13. Support plate; 14. Nut; 15. Sealing ring; 16. Retaining ring; 17. Four-way ring; 18. Anti-slip ring; 19. Annular groove; 20. Slider, 21. Locking device; 2101. Handwheel; 2102. Locking rod; 2103. Connecting socket; 2104. Locking socket. DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example 1:

[0038] like Figures 1 to 3 The device for convenient assembly and disassembly of a self-sealing manhole cover shown in the figure comprises an outer door 2 hingedly connected to a manhole boss 1. Four through-holes 3 are formed on the outer wall of the outer door 2 and are evenly distributed circumferentially about the central axis of the manhole boss 1. A guide rod 4 is inserted into each through-hole 3. One end of the guide rod 4 extends into the manhole boss 1 and is threadedly connected to the outer end face of the manhole cover 5. The other end extends outside the outer door 2. A linear drive device 6 is also connected to the outer wall of the outer door 2, coaxially arranged with the central axis of the manhole boss 1. The output end 7 of the linear drive device 6 is connected to the end of each guide rod 4 located outside the outer door 2 via a connector 8. This drives each guide rod 4 to extend and retract axially, thereby driving the manhole cover 5 to slide within the manhole boss 1, thereby enabling the disassembly and assembly of the manhole cover 5.

[0039] In this embodiment, the outer hole door 2 is hinged to the left or right side of the manhole boss 1 via a hinge 9. The hinge shaft 901 of the hinge 9 is arranged vertically, so that the outer hole door 2 can be swung horizontally to open the manhole boss. The end of the outer hole door 2 away from the hinge 9 is locked to the manhole boss 1 via a locking device 21. The structure of the locking device 21 is not fixed. In this embodiment, the locking device 21 is formed by a locking rod 2102 with a handwheel 2101, which passes through a socket 2103 on the outer hole door 2 and is threadedly connected to a locking socket 2104 on the outer wall of the manhole boss 1. The end of the locking rod 2102 away from the handwheel 2101 is a screw segment with a smaller diameter.

[0040] The outer door 2 has a groove 10 on one end thereof facing the manhole cover 5, which is adapted to fit the manhole cover 5. The depth of the groove 10 is not less than the thickness of the manhole cover 5. The groove 10 is used to accommodate the manhole cover 5. When the manhole cover 5 is driven by the linear drive device 6 to move out of the manhole boss 1, it enters the groove 10 and is fixed in the groove 10 by the linear drive device 6 to maintain a stable state.

[0041] The connector 8 described in this embodiment includes a base 801 and four connecting rods 802. The connecting rods 802 correspond to the guide rods 4 one by one. Each connecting rod 802 is evenly distributed around the linear drive device 6. One end of the connecting rod 802 is provided with a connecting hole 803 and is sleeved on the corresponding guide rod 4 to form a connecting portion 804. The other end of the connecting rod 802 extends to the base 801 and is connected to the base 801. The base 801 is detachably connected to the output end 7 of the linear drive device 6. The structure of the entire connector 8 is umbrella-shaped, and the connecting rods 802 are equivalent to the ribs of the umbrella. A single linear drive device 6 is used to achieve synchronous driving of the four guide rods 4 through the connector 8 to achieve balanced and synchronous pulling force at the four corners of the manhole cover 5, thereby preventing the manhole cover 5 from tilting and getting stuck when being pulled out or pushed in due to uneven force.

[0042] In this embodiment, a support member 11 for supporting each connecting rod 802 is preferably connected to the outer wall of the outer hole door 2, and a support surface 12 corresponding to each connecting rod 802 is provided on the support member 11. Figure 2 As shown, each support surface 12 is parallel to the central axis of the manhole boss 1, and each connecting rod 802 is in sliding contact with the corresponding support surface 12. The support member 11 is preferably the outer wall of the linear drive device 6. In actual applications, a cylindrical body sleeved around the outer periphery of the linear drive device 6 or a "["-shaped bracket with one end connected to the outer manhole door 2 and the other end connected to the outer shell of the linear drive device 6 can also be used.

[0043] The purpose of setting the support member 11 is to support the radial component of the tension exerted on the connecting rod 802, so as to avoid the tension of the connecting rod 802 driving the four guide rods 4 to deviate toward the linear drive device, ensuring that each guide rod 4 slides along its axial direction and ensuring the stability of the movement direction of the manhole cover 5.

[0044] like Figure 4 As shown, in actual application, support plates 13 can be connected between adjacent connecting rods 802 to improve the bending resistance of the connecting rods 802, thereby resisting the radial component of the tension exerted on the connecting rods 802, and also playing the role of the support member 11.

[0045] In this embodiment, the guide rod 4 is threaded at each end. A nut 14 is connected to the end of the guide rod 4 that extends beyond the outer manhole door 2. This nut 14 is positioned downstream of the connecting portion 804 in the direction of movement. Specifically, when the linear drive 6 drives the connecting member 8 and the guide rod 4 toward the manhole boss 1, the nut 14 is positioned between the outer manhole door 2 and the connecting portion 804. When the linear drive 6 drives the connecting member 8 and the guide rod 4 outward, the connecting portion 804 is positioned between the nut 14 and the outer manhole door 2. Because the connecting member 8 is detachable, the user can adjust the relative position of the nut 14 and the connecting portion 804 as needed.

[0046] But for easier operation, one end of any guide rod 4 extending out of the outer hole door 2 is connected to two nuts 14, and the connecting portion 804 is clamped in the middle by the two nuts 14.

[0047] The overall linear drive device 6 of this embodiment is preferably a hydraulic push rod, the cylinder body of the hydraulic push rod is connected to the outer wall of the outer hole door 2, and the push rod end of the hydraulic push rod is detachably connected to the connecting member 8 as the output end 7, for example, the output end 7 passes through the connecting member 8 and is locked by a nut.

[0048] In practical applications, other linear drive devices such as linear motors and lead screw motors can be used to drive the connector 8 , but the specific structure of the connector 8 needs to be adaptively adjusted according to different types of linear drive devices 6 .

[0049] As an improvement to the above technical solution, the linear drive device 6 of this embodiment is detachably connected to the outer hole door 2, and the connecting member 8 is detachably connected to the output end 7 of the linear drive device 6. In this way, the connecting member 8 and the linear drive device 6 can be removed during non-maintenance periods, thereby improving the cleanliness of the exterior of the outer hole door 2 and reducing the wiring and piping of the linear drive device.

[0050] The working process of this embodiment is shown in Example 2. Example 2:

[0051] refer to Figures 1 to 3 The method for using the convenient disassembly and assembly device for the self-sealing manhole cover according to the first embodiment includes the following specific steps:

[0052] S1 initial installation process;

[0053] S11. Thread the manhole cover 5 into the guide rods 4, then pass the outer hole door 2 through the guide rods 4 and sleeve it onto the manhole cover 5, so that the manhole cover 5 is embedded in the groove 10;

[0054] S12, installing the linear drive device 6 on the outer wall of the outer hole door 2, controlling the output end of the linear drive device 6 to extend to a set position, and connecting the output end 7 of the linear drive device 6 to each guide rod 4 using a connector 8;

[0055] S13, lift the outer hole door 2 and the manhole cover 5 together to the mouth of the manhole boss 1, adjust the position of the outer hole door 2 and the manhole boss 1 so that the manhole cover 5 is aligned with the inner hole of the manhole boss 1, and connect the outer hole door 2 and the manhole boss 1 with a hinge;

[0056] S14, cover the outer hole door 2 and lock it, control the output end 7 of the linear drive device 6 to retract, and the linear drive device 6 drives each guide rod 4 to move into the manhole boss 1 through the connecting member 8, and each guide rod 4 pushes the manhole cover 5 into the manhole boss 1;

[0057] S15. Remove the connector 8, unscrew the guide rods 4 from the manhole cover 5, open the outer door 2, and install the sealing ring 15, retaining ring 16, four-ring 17, and anti-slip ring 18 into the manhole boss 1 in sequence;

[0058] S16, cover the outer hole door 2 and lock it;

[0059] S2, maintenance process;

[0060] S21, unlock and open the outer hole door 2; remove the anti-slip ring 18, the four-ring 17, the retaining ring 16, and the sealing ring 15 in sequence;

[0061] S22. Cover the outer hole door 2 and lock it, insert the guide rods 4 into each through hole 3 of the outer hole door 2, and thread each guide rod 4 to the manhole cover 5. Install the connector 8, connect one end of the connector 8 to each guide rod 4 and lock it with a nut 14, and connect the other end to the output terminal 7 of the linear drive device 6;

[0062] S22, controlling the output end 7 of the linear drive device 6 to extend, and the output end 7 drives each guide rod 4 to move outward through the connecting member 8, and each guide rod 4 drives the manhole cover 5 to move outward until it leaves the manhole boss 1 and enters the groove 10 on the outer hole door 2;

[0063] S23, unlock and open the outer hole door 2 for maintenance;

[0064] S24. After the inspection is completed, repeat S14-16 to complete the inspection.

[0065] As an improvement to the above-mentioned method of use, after completing S16 or S24, the linear drive device 6 and the connecting member 8 are removed, and when performing step S22, the linear drive device 6 and the connecting member 8 are installed on the outer hole door 2.

[0066] As a further improvement to the above-mentioned method of use, after removing the sealing ring 15 , an arc-shaped slider 20 is filled into the annular groove 19 for embedding the four-ring 17 , so that the concave arc surface of the slider 20 is flush with the inner surface of the manhole boss 1 to prevent the manhole cover 5 from being stuck in the annular groove 19 .

[0067] According to Examples 1 and 2, it can be concluded that the disassembly and assembly device described in the present invention is configured with an outer hole door 2 and a linear drive device 6 connected to the outer hole door 2. The linear drive device 6 is used to smoothly pull the manhole cover 5 out of the manhole boss 1 through multiple guide rods 4 and embed it in the groove 10 of the outer hole door 2. In this way, the manhole cover 5 can be rotated to the side of the manhole boss 1 by simply rotating the outer hole door 2, and the manhole boss 1 is opened for the user to enter the container for maintenance. The manhole cover 5 is restricted by the groove 10 and the force of the linear drive device 6, and can be stably maintained on the outer hole door 2, effectively avoiding the shaking of the manhole cover 5 and causing collision damage to the equipment and operators, and improving the disassembly efficiency and assembly efficiency of the manhole cover 5.

[0068] The method of use described in the present invention only uses a lifting device during the initial installation process, and the lifting device is no longer needed during the subsequent maintenance process. Therefore, the operating process of disassembling and assembling the device during the maintenance process is simplified, safety risks are reduced, and disassembly and assembly efficiency is improved.

[0069] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some embodiments of its application, and are not intended to limit the present invention. It should be noted that a person skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A self-sealing manhole cover convenient disassembly and assembly device, characterized in that: The invention comprises an outer hole door (2) hinged on the manhole boss (1), and at least three through holes (3) uniformly distributed circumferentially with the central axis of the manhole boss (1) as the center are opened on the outer wall of the outer hole door (2), and a guide rod (4) is inserted into each through hole (3), and one end of the guide rod (4) extends into the manhole boss (1) and is threadedly connected to the outer end face of the manhole cover (5), and the other end extends out of the outer hole door (2), and a linear drive device (6) coaxially arranged with the central axis of the manhole boss (1) is also connected to the outer wall of the outer hole door (2), and the output end (7) of the linear drive device (6) is connected to one end of each guide rod (4) located outside the outer hole door (2) through a connecting piece (8), so as to drive each guide rod (4) to expand and contract axially, thereby driving the manhole cover (5) to slide in the manhole boss (1); The outer hole door (2) is hinged to the left or right side of the manhole boss (1) via a hinge (9), the hinge shaft (901) of the hinge (9) is vertically arranged, and the end of the outer hole door (2) away from the hinge (9) is locked with the manhole boss (1); The outer hole door (2) is provided with a groove (10) adapted to the manhole cover (5) at one end thereof facing the manhole cover (5), and the depth of the groove (10) is not less than the thickness of the manhole cover (5); The connecting member (8) includes a base (801) and a plurality of connecting rods (802), wherein the connecting rods (802) correspond to the guide rods (4) one by one, and each connecting rod (802) is evenly distributed around the linear drive device (6) in the circumferential direction. One end of the connecting rod (802) is provided with a connecting hole (803) and is sleeved on the corresponding guide rod (4) to form a connecting portion (804). The other end of the connecting rod (802) extends to the base (801) and is connected to the base (801); A support member (11) for supporting each connecting rod (802) is connected to the outer wall of the outer hole door (2), and a support surface (12) corresponding to the connecting rod (802) is provided on the support member (11), and each supporting surface (12) is parallel to the central axis of the manhole boss (1). Each connecting rod (802) is slidably attached to the corresponding supporting surface (12), and the support member (11) is the outer wall of the linear drive device (6) or a cylinder sleeved on the outer periphery of the linear drive device (6) or a "["-shaped bracket with one end connected to the outer hole door (2) and the other end connected to the outer shell of the linear drive device (6); Both ends of the guide rod (4) are respectively provided with threads, and one end of the guide rod (4) extending out of the outer hole door (2) is connected to at least one nut (14), and the nut (14) is provided on the downstream side of the movement direction of the connecting portion (804); The linear drive device (6) is a hydraulic push rod, the cylinder body of the hydraulic push rod is connected to the outer wall of the outer hole door (2), and the push rod end of the hydraulic push rod is connected to the connecting piece (8) as the output end (7).

2. The convenient disassembly and assembly device for a self-sealing manhole cover according to claim 1, characterized in that: Support plates (13) are connected between adjacent connecting rods (802).

3. The convenient disassembly and assembly device for a self-sealing manhole cover according to claim 1, characterized in that: The linear drive device (6) is detachably connected to the outer hole door (2), and the connecting member (8) is detachably connected to the output end (7) of the linear drive device (6).

4. A method for using the self-sealing manhole cover convenient disassembly and assembly device according to any one of claims 1 to 3, characterized in that: The specific steps include: S1 initial installation process; S11, threading the manhole cover (5) to the guide rods (4), then inserting the outer hole door (2) through the guide rods (4) and sleeve-connecting it to the manhole cover (5), so that the manhole cover (5) is embedded in the groove (10); S12, installing the linear drive device (6) on the outer wall of the outer hole door (2), controlling the output end of the linear drive device (6) to extend to a set position, and connecting the output end (7) of the linear drive device (6) to each guide rod (4) using a connecting member (8); S13, hoist the outer hole door (2) and the manhole cover (5) together to the mouth of the manhole boss (1), adjust the position of the outer hole door (2) and the manhole boss (1) so that the manhole cover (5) is aligned with the inner hole of the manhole boss (1), and connect the outer hole door (2) and the manhole boss (1) with a hinge; S14, cover the outer hole door (2) and lock it, control the output end (7) of the linear drive device (6) to retract, the linear drive device (6) drives each guide rod (4) to move into the manhole boss (1) through the connecting member (8), and each guide rod (4) pushes the manhole cover (5) into the manhole boss (1); S15, remove the connector (8), unscrew each guide rod (4) from the manhole cover (5), open the outer hole door (2), and install the sealing ring (15), retaining ring (16), four-ring (17), and anti-slip ring (18) in the manhole boss (1) in sequence; S16, cover the outer hole door (2) and lock it; S2, maintenance process; S21, unlock and open the outer hole door (2); remove the anti-slip ring (18), the four-ring (17), the retaining ring (16), and the sealing ring (15) in sequence; S22, cover the outer hole door (2) and lock it, insert the guide rods (4) into each through hole (3) of the outer hole door (2), and thread each guide rod (4) to the manhole cover (5), install the connecting piece (8), connect one end of the connecting piece (8) to each guide rod (4) and lock it with a nut (14), and connect the other end to the output end (7) of the linear drive device (6); S22, controlling the output end (7) of the linear drive device (6) to extend, the output end (7) drives each guide rod (4) to move outward through the connecting member (8), and each guide rod (4) drives the manhole cover (5) to move outward until it is separated from the manhole boss (1) and enters the groove (10) on the outer hole door (2); S23, unlock and open the outer hole door (2) for maintenance; S24. After the inspection is completed, repeat S14-16 to complete the inspection.

5. The method of use according to claim 4, characterized in that: After completing S16 or S24, the linear drive device (6) is removed, and when performing step S22, the linear drive device (6) is installed on the outer hole door (2).

6. The method of use according to claim 4, characterized in that: During step S21, after removing the sealing ring (15), the arc-shaped slider (20) is filled into the annular groove (19) for embedding the four-ring (17), so that the concave arc surface of the slider (20) is flush with the inner surface of the manhole boss (1).

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