Convenient and fast disassembly and assembly device for self-sealing manhole cover and use method of convenient and fast disassembly and assembly device

Abstract

The self-sealing manhole cover convenient dismounting and mounting device comprises an outer hole door, a guide rod is inserted into a through hole in the outer wall of the outer hole door, one end of the guide rod is in threaded connection with the outer end face of the manhole cover, the other end of the guide rod extends out of the outer hole door, and a linear driving device is connected to the outer wall of the outer hole door. The output end of the linear driving device is connected with each guide rod through a connecting piece to drive each guide rod to stretch out and draw back in the axial direction and drive the manhole cover to slide in the manhole boss; the outer hole door is hinged to the left side or the right side of the manhole boss through a hinge, a hinged shaft of the hinge is vertically arranged, and the side, away from the hinge, of the outer hole door is locked with the manhole boss; a groove is formed in the end, facing the manhole cover, of the outer hole door, and the depth of the groove is not smaller than the thickness of the manhole cover. The manhole cover dismounting device solves the technical problems that an existing dismounting device cannot stably dismount a manhole cover, the manhole cover is unconstrained after being dismounted, and collision is likely to occur to cause equipment damage.

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 and assembly device for a self-sealing manhole cover and a using method thereof. Background Art

[0002] Among the equipment of thermal power plants, high-pressure and low-pressure heaters are indispensable important component equipment, and manholes are often provided thereon. Through the manholes, maintenance personnel can enter the pressure vessels for maintenance, cleaning and other operations. When the pressure vessels are working properly, the manholes need to be sealed, and the four-piece ring self-sealing manhole cover is a commonly used reliable sealing structure for high-pressure vessels. This structure consists of a tubular manhole boss connecting the side wall of the container, a manhole cover, a sealing ring, a retaining ring, a four-piece ring, a restraint ring and several screw rods arranged in the manhole boss from inside to outside. A retaining ring is also arranged inside the four-piece ring to prevent the four-piece ring from falling off. Although such a structure is reliable, during maintenance, the process of disassembling and assembling the manhole cover is extremely complex, and the manhole cover is very heavy. When pulling it out, special equipment is required, and hoisting equipment is also needed to cooperate for hoisting the manhole cover. The entire disassembly process is time-consuming and laborious, and there are great safety hazards. After the maintenance of the container is completed, reassembling the manhole cover requires reverse operation again. Therefore, this kind of self-sealing manhole cover is very uneconomical and unsafe during maintenance.

[0003] In order to solve the above technical problems, the invention patent with the publication number CN220718336U discloses a disassembly and assembly device for a four-piece ring self-sealing manhole door, which uses a sliding mechanism to move the manhole door (equivalent to the manhole cover in the present application) axially and horizontally, so as to simplify the equipment used in the disassembly process and reduce the disassembly cost. However, it cannot solve the complex procedures and high costs during installation. During disassembly, the radial offset of the force on the manhole door causes jamming when the manhole door slides out, increasing the disassembly difficulty and easily damaging the inner wall of the manhole boss. The shaking generated by the manhole door suspended by the sliding mechanism poses a collision risk and poses a safety hazard to the equipment and operators. When installing, the position of the manhole door needs to be adjusted, increasing the difficulty during installation. Therefore, such a disassembly and assembly device still has many deficiencies. 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 disassemble and assemble the manhole cover smoothly, and there is no restraint on the manhole cover after it is disassembled, which is easy to cause collision and damage to the equipment.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a convenient disassembly and assembly device for a self-sealing manhole cover, which includes an outer hole door hinged on a manhole boss. At least three through holes are circumferentially and evenly distributed on the outer wall of the outer hole door with the central axis of the manhole boss as the center. A guiding rod is inserted into each through hole. One end of the guiding 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. A linear driving 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 driving device is connected to one end of each guiding rod located outside the outer hole door through a connecting piece, driving each guiding rod to expand and contract axially, driving the manhole cover to slide in the manhole boss; the outer hole door is hinged on the left or right side of the manhole boss through a hinge, the hinge axis of the hinge is vertically arranged, and the end of the outer hole door away from the hinge is locked with the manhole boss; a groove adapted to the manhole cover is opened at one end of the outer hole door facing 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 piece includes a base and several connecting rods. The connecting rods correspond to the guiding rods one by one. The connecting rods are circumferentially and evenly distributed around the linear driving device. A connecting hole is opened at one end of each connecting rod and sleeved on the corresponding guiding 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 supporting piece for supporting each connecting rod is connected to the outer wall of the outer hole door. The supporting piece is provided with supporting surfaces corresponding to the connecting rods one by one. Each supporting surface is parallel to the central axis of the manhole boss. Each connecting rod is in sliding contact with the corresponding supporting surface. The supporting piece is the outer wall of the linear driving device or a cylinder sleeved around the linear driving device or a "[-]" shaped bracket with one end connected to the outer hole door and the other end connected to the outer shell of the linear driving device.

[0008] As a preferred solution, a supporting plate is connected between adjacent connecting rods.

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

[0010] As a preferred solution, the linear driving 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 end of the push rod of the hydraulic push rod serves as the output end and is connected to the connecting piece.

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

[0012] The secondary 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 of inconvenient operation and safety risks of the existing disassembly and assembly devices.

[0013] To solve the above technical problems, the technical solution adopted by the present invention is as follows: Based on the usage method of the above self-sealing manhole cover convenient disassembly and assembly device, it includes the following specific steps: S1 Initial installation process; S11. Thread-connect the manhole cover with each guide rod, and then pass the outer hole door through each guide rod and socket it with the manhole cover, so that the manhole cover is embedded in the groove; S12. Install the linear driving device on the outer wall of the outer hole door, control the output end of the linear driving device to extend to the set position, and use a connecting piece to connect the output end of the linear driving device with each guide rod; S13. Lift the outer hole door and the manhole cover together to the orifice of the manhole boss, adjust the positions of the outer hole door and the manhole boss, make the inner hole of the manhole cover align with the inner hole of the manhole boss, and connect the outer hole door and the manhole boss with a hinge; S14. Close and lock the outer hole door, control the output end of the linear driving device to retract, and the linear driving device drives each guide rod to move inward into the manhole boss through the connecting piece, and each guide rod pushes the manhole cover into the manhole boss; S15. Remove the connecting piece, unscrew each guide rod from the manhole cover, open the outer hole door, and install a sealing ring, a retaining ring, a four-piece ring, and an anti-disengagement ring into the manhole boss in sequence; S16. Close and lock the outer hole door; S2. Maintenance process; S21. Unlock and open the outer hole door; remove the anti-disengagement ring, the four-piece ring, the retaining ring, and the sealing ring in sequence; S22. Close and lock the outer hole door, insert guide rods into each through hole of the outer hole door, and thread-connect each guide rod with the manhole cover. Install a connecting piece, connect one end of the connecting piece with each guide rod and lock it with a nut, and connect the other end with the output end of the linear driving device; S22. Control the output end of the linear driving 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 disengages from the manhole boss and enters the groove on the outer hole door; S23. Unlock and open the outer hole door for maintenance; S24. After the maintenance is completed, repeat S14 - 16 to complete the maintenance.

[0014] As a preferred solution, after completing S16 or S24, remove the linear driving device, and when performing step S22, install the linear driving device on the outer hole door again.

[0015] As a preferred solution, when performing step S21, after removing the sealing ring, fill the annular groove for embedding the four-piece ring with arc-shaped sliders, so that the concave arc surface of the slider is flush with the inner surface of the manhole boss.

[0016] The beneficial effects of the present invention are as follows: By providing an outer hole door and a linear driving device connected to the outer hole door, the linear driving device smoothly pulls the manhole cover out of the manhole boss through multiple guide rods and embeds it in the outer hole door. In this way, by simply rotating the outer hole door, the manhole cover can be rotated to one side of the manhole boss to open the manhole boss for users to enter the container for maintenance. Restricted by the groove and the acting force of the linear driving device, the manhole cover can be stably held on the outer hole door, effectively avoiding collision damage to the equipment and operators caused by the shaking of the manhole cover, and improving the disassembly efficiency and assembly efficiency of the manhole cover.

[0017] The usage method of the present invention only uses a hoisting device during the initial installation process, and no hoisting device is required during the later maintenance process. Therefore, the operation process of the disassembly and assembly device during the maintenance process is simplified, and the safety risk is reduced. Brief Description of the Drawings

[0018] The following further details the specific embodiments of the present invention with reference to the drawings, where: Figure 1 is the front view of the disassembly and assembly device of the present invention; Figure 2 is Figure 1 the A-A sectional view of Figure 3 is based on Figure 2 the schematic diagram of the disassembled state of the manhole cover; Figure 4 is the schematic diagram of the connection structure between the connecting rod and the support plate of the connecting piece in Embodiment 1; Figures 1 to 4 In the figure: 1, manhole boss; 2, outer hole door; 3, through hole; 4, guide rod; 5, manhole cover; 6, linear driving device; 7, output end; 8, connecting piece; 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-piece ring; 18, anti-disengagement ring; 19, annular groove; 20, slider, 21, locking device; 2101, handwheel; 2102, locking rod; 2103, socket; 2104, locking seat. Specific Embodiments

[0019] The following details the specific implementation plans of the present invention with reference to the drawings. Embodiment 1:

[0020] As Figures 1 to 3A convenient disassembly and assembly device for a self-sealing manhole cover as shown, includes an outer hole door 2 hinged on a manhole boss 1. Four through holes 3 are circumferentially and evenly distributed on the outer wall of the outer hole door 2 with the central axis of the manhole boss 1 as the center. 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, and the other end extends outside the outer hole door 2. A linear driving 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. The output end 7 of the linear driving device 6 is connected to one end of each guide rod 4 located outside the outer hole door 2 through a connecting piece 8, driving each guide rod 4 to axially expand and contract, driving the manhole cover 5 to slide in the manhole boss 1, so as to realize the disassembly and assembly of the manhole cover 5.

[0021] In this embodiment, the outer hole door 2 is hinged on the left or right side of the manhole boss 1 through a hinge 9. The hinge shaft 901 of the hinge 9 is vertically arranged, so that the outer hole door 2 can swing horizontally to open the manhole boss. One end of the outer hole door 2 away from the hinge 9 is locked to the manhole boss 1 through a locking device 21. The structure of the locking device 21 is not fixed. In this embodiment, a locking rod 2102 with a handwheel 2101 passes through a socket 2103 on the outer hole door 2 and is threadedly connected to a locking seat 2104 on the outer wall of the manhole boss 1 to form the locking device 21. One end of the locking rod 2102 away from the handwheel 2101 is a screw rod section with a smaller diameter.

[0022] One end of the outer hole door 2 facing the manhole cover 5 is provided with a groove 10 adapted to the manhole cover 5, and 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 driving device 6 and moves out of the manhole boss 1, it enters the groove 10 and is fixed in the groove 10 by the linear driving device 6 to maintain a stable state.

[0023] The connecting piece 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. The connecting rods 802 are circumferentially and evenly distributed around the linear driving device 6. One end of each connecting rod 802 is provided with a connecting hole 803 and is sleeved on the corresponding guide rod 4 to form a connecting part 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 driving device 6. The structure of the whole connecting piece 8 is in the shape of an umbrella, and the connecting rods 802 are equivalent to umbrella ribs. A single linear driving device 6 realizes the synchronous driving of the four guide rods 4 through the connecting piece 8, so as to realize the balance and synchronism of the pulling forces at the four corners of the manhole cover 5, and avoid the manhole cover 5 from being tilted due to uneven stress when being pulled out or pushed in, resulting in jamming.

[0024] Preferably in this embodiment, a support member 11 for supporting each connecting rod 802 is connected to the outer wall of the outer hole door 2. Support surfaces 12 corresponding to the connecting rods 802 one by one are arranged on the support member 11, such as Figure 2As shown, each supporting 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 supporting surface 12. The support member 11 is preferably the outer wall of the linear drive device 6. In practical applications, a cylinder sleeved around 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 can also be used.

[0025] The purpose of setting the support member 11 is to support the radial component of the tensile force on the connecting rod 802, which can prevent the tensile force of the connecting rod 802 from driving the four guide rods 4 to shift towards 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.

[0026] As Figure 4 shown, in practical applications, a support plate 13 can be connected between adjacent connecting rods 802 to improve the bending resistance of the connecting rod 802, thereby resisting the radial component of the tensile force on the connecting rod 802 and also playing the role of the support member 11.

[0027] In this embodiment, threads are respectively provided at both ends of the guide rod 4. One end of the guide rod 4 extending out of the outer hole door 2 is connected with a nut 14, and this nut 14 is arranged on the downstream side of the movement direction of the connecting portion 804. That is, when the linear drive device 6 drives the connecting member 8 and the guide rod 4 to move into the manhole boss 1, this nut 14 is located between the outer hole door 2 and the connecting portion 804; when the linear drive device 6 drives the connecting member 8 and the guide rod 4 to move outwards, the connecting portion 804 is located between the nut 14 and the outer hole door 2. Since the connecting member 8 is detachable, the user can change the relative position relationship between the nut 14 and the connecting portion 804 according to needs.

[0028] However, for more convenient operation. One end of any guide rod 4 extending out of the outer hole door 2 is connected with two nuts 14, and the connecting portion 804 is clamped in the middle by the two nuts 14.

[0029] In this embodiment, the linear drive device 6 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 end of the push rod of the hydraulic push rod is used as the output end 7 and is detachably connected to the connecting member 8. For example, the output end 7 passes through the connecting member 8 and is locked by a nut.

[0030] In practical applications, other linear drive devices such as linear motors and lead screw motors can be used to drive the connecting member 8, but the specific structure of the connecting member 8 needs to be adjusted adaptively according to different types of the linear drive device 6.

[0031] As an improvement to the above technical solution, the linear drive device 6 in 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 to improve the neatness outside the outer hole door 2 and reduce the lines and pipelines of the linear drive device.

[0032] For the working process of this embodiment, refer to Embodiment 2. Embodiment 2:

[0033] Refer to Figures 1 to 3 , based on the usage method of the self-sealing manhole cover convenient disassembly and assembly device described in the above Embodiment 1, includes the following specific steps: S1 Initial installation process; S11. Thread the manhole cover 5 onto each guide rod 4, and then pass the outer hole door 2 through each guide rod 4 and socket it with the manhole cover 5, so that the manhole cover 5 is fitted into the groove 10. S12. Install the linear drive device 6 on the outer wall of the outer hole door 2, control the output end of the linear drive device 6 to extend to the set position, and use the connecting member 8 to connect the output end 7 of the linear drive device 6 with each guide rod 4. S13. Lift the outer hole door 2 and the manhole cover 5 together to the mouth of the manhole boss 1, adjust the positions 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. Close and lock the outer hole door 2, 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. S15. Remove the connecting member 8, unscrew each guide rod 4 from the manhole cover 5, open the outer hole door 2, and sequentially install the sealing ring 15, retaining ring 16, four-piece ring 17, and anti-disengagement ring 18 into the manhole boss 1. S16. Close and lock the outer hole door 2. S2. Maintenance process; S21. Unlock and open the outer hole door 2; sequentially remove the anti-disengagement ring 18, four-piece ring 17, retaining ring 16, and sealing ring 15. S22. Close and lock the outer hole door 2, insert the guide rod 4 into each through hole 3 of the outer hole door 2 and thread each guide rod 4 onto the manhole cover 5, install the connecting member 8, connect one end of the connecting member 8 with each guide rod 4 and lock it with a nut 14, and connect the other end with the output end 7 of the linear drive device 6. S22. Control 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 disengages 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 completing the maintenance, repeat S14 - 16 to complete the maintenance.

[0034] As an improvement to the above - mentioned usage method, after completing S16 or S24, remove the linear drive device 6 and the connecting piece 8, and when performing step S22, reinstall the linear drive device 6 and the connecting piece 8 onto the outer hole door 2.

[0035] As a further improvement to the above - mentioned usage method, after removing the sealing ring 15, fill the annular groove 19 for embedding the four - joint ring 17 with the arc - shaped slider 20, making the concave arc surface of the slider 20 flush with the inner surface of the manhole boss 1 to prevent the manhole cover 5 from getting stuck in the annular groove 19.

[0036] According to Embodiment 1 and Embodiment 2, it can be concluded that the disassembly and assembly device of the present invention is provided with an outer hole door 2 and a linear drive device 6 connected to the outer hole door 2. The linear drive device 6 smoothly pulls the manhole cover 5 out of the manhole boss 1 through multiple guide rods 4 and embeds it in the groove 10 of the outer hole door 2. In this way, by simply rotating the outer hole door 2, the manhole cover 5 can be rotated to one side of the manhole boss 1 to open the manhole boss 1 for users to enter the container for maintenance. The manhole cover 5 is restricted by the groove 10 and the acting force of the linear drive device 6, and can be stably held on the outer hole door 2, effectively avoiding the collision damage caused by the shaking of the manhole cover 5 to the equipment and the operator, and improving the disassembly efficiency and assembly efficiency of the manhole cover 5.

[0037] The usage method of the present invention only uses the lifting device during the initial installation process, and no longer requires the lifting device during the later maintenance process. Therefore, the operation process of the disassembly and assembly device during maintenance is simplified, the safety risk is reduced, and the disassembly and assembly efficiency is improved.

[0038] The above - mentioned embodiments only illustratively explain the principle and efficacy of the present invention and some applied embodiments, rather than limiting the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A convenient disassembly and assembly device for a self-sealing manhole cover, characterized in that, It includes an outer hole door (2) hinged on a manhole boss (1). At least three through holes (3) are circumferentially and evenly distributed around the central axis of the manhole boss (1) on the outer wall of the outer hole door (2). 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), and the other end extends outside the outer hole door (2). A linear driving 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). The output end (7) of the linear driving device (6) is connected to one end of each guide rod (4) located outside the outer hole door (2) through a connecting piece (8) to drive each guide rod (4) to axially expand and contract, driving the manhole cover (5) to slide in the manhole boss (1). The outer hole door (2) is hinged on the left or right side of the manhole boss (1) through a hinge (9). The hinge shaft (901) of the hinge (9) is vertically arranged, and one end of the outer hole door (2) away from the hinge (9) is locked to the manhole boss (1). One end of the outer hole door (2) facing the manhole cover (5) is provided with a groove (10) adapted to the manhole cover (5), and the depth of the groove (10) is not less than the thickness of the manhole cover (5).

2. The self-sealing manhole cover convenient disassembly and assembly device according to claim 1, characterized in that, The connecting piece (8) includes a base (801) and several connecting rods (802). The connecting rods (802) correspond to the guide rods (4) one by one. Each connecting rod (802) is circumferentially and evenly distributed around the linear driving device (6). One end of each connecting rod (802) is provided with a connecting hole (803) and is sleeved on the corresponding guide rod (4) to form a connecting part (804), and the other end of the connecting rod (802) extends to the base (801) and is connected to the base (801).

3. The self-sealing manhole cover convenient disassembly and assembly device according to claim 2, characterized in that, A support member (11) for supporting each connecting rod (802) is connected to the outer wall of the outer hole door (2). A support surface (12) corresponding to the connecting rod (802) one by one is provided on the support member (11). Each support surface (12) is parallel to the central axis of the manhole boss (1). Each connecting rod (802) is in sliding contact with the corresponding support surface (12). The support member (11) is the outer wall of the linear driving device (6) or a cylinder sleeved around the linear driving 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 driving device (6).

4. The self-sealing manhole cover convenient disassembly and assembly device according to claim 2, characterized in that, A support plate (13) is connected between adjacent connecting rods (802).

5. The self-sealing manhole cover convenient disassembly and assembly device according to claim 2, characterized in that, Threads are respectively arranged at both ends of the guide rod (4). At least one nut (14) is connected to the end of the guide rod (4) extending outside the outer hole door (2), and the nut (14) is arranged on the downstream side of the moving direction of the connecting part (804).

6. The self-sealing manhole cover convenient disassembly and assembly device according to claim 1, characterized in that, The linear driving 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 end of the push rod of the hydraulic push rod serves as the output end (7) and is connected to the connecting piece (8).

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

8. The usage method of the convenient disassembly and assembly device for the self-sealing manhole cover according to any one of claims 1 to 7, characterized in that, It includes the following specific steps: S1 Initial installation process; S11. Thread the manhole cover (5) onto each guide rod (4), then pass the outer hole door (2) through each guide rod (4) and socket it with the manhole cover (5) so that the manhole cover (5) is fitted into the groove (10). S12. Install the linear drive device (6) on the outer wall of the outer hole door (2), control the output end of the linear drive device (6) to extend to the set position, and use the connecting piece (8) to connect the output end (7) of the linear drive device (6) to each guide rod (4). 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 hinge the outer hole door (2) and the manhole boss (1). S14. Close and lock the outer hole door (2), 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 piece (8), and each guide rod (4) pushes the manhole cover (5) into the manhole boss (1). S15. Remove the connecting piece (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-piece ring (17), and anti-disengagement ring (18) into the manhole boss (1) in sequence. S16. Close and lock the outer hole door (2). S2. Maintenance process. S21. Unlock and open the outer hole door (2); remove the anti-disengagement ring (18), four-piece ring (17), retaining ring (16), and sealing ring (15) in sequence. S22. Close and lock the outer hole door (2), insert the guide rod (4) into each through hole (3) of the outer hole door (2), thread each guide rod (4) onto 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 the nut (14), and connect the other end to the output end (7) of the linear drive device (6). S22. Control 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 piece (8), and each guide rod (4) drives the manhole cover (5) to move outward until it disengages 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 maintenance is completed, repeat S14 - 16 to complete the maintenance.

9. The usage method according to claim 8, wherein After completing S16 or S24, remove the linear drive device (6), and when performing step S22, install the linear drive device (6) on the outer hole door (2) again.

10. The usage method according to claim 8, characterized in that, When performing step S21, after removing the sealing ring (15), fill the annular groove (19) for embedding the four-piece ring (17) with the arc-shaped slider (20) 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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