Self-drainage-increasing type drainage well lid

Abstract

The invention relates to the technical field of municipal engineering equipment, in particular to an automatic drainage increasing type drainage well lid. Comprising a well base and a well lid, the well lid is rotationally connected to the well base, and a first drainage hole is formed in the well lid; a plurality of second drain holes are formed in the well lid in the circumferential direction at intervals, the mounting plate is arranged below the well lid, and the multiple plug blocks in one-to-one correspondence with the second drain holes are connected to the mounting plate in the circumferential direction at intervals. Through the first drainage hole and the second drainage hole in the well lid and precise cooperation among the mounting plate, the blocking block and the lifting assembly, the function of automatically adjusting the drainage amount according to the street water amount can be achieved, under the normal condition, the second drainage hole can be blocked by the blocking block, impurities are prevented from entering, and under the extreme weather such as rainstorm, the drainage amount can be automatically adjusted. When accumulated water in the water containing barrel is increased and the weight of the water containing barrel exceeds the attraction force between the magnets, the blocking block descends to open the second drainage hole, so that the drainage capacity is remarkably improved, and the urban inland inundation phenomenon is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal engineering equipment, and particularly to a self-increasing drainage manhole cover. Background Art

[0002] With the acceleration of the urbanization process, urban infrastructure construction is facing more and more challenges. Among them, the urban drainage system, as an important part to ensure the normal operation of the city, is of self-evident importance. However, the traditional manhole cover design seems inadequate when faced with the complex and changeable urban environment and is difficult to meet the modern city's demand for efficient and safe drainage.

[0003] Most of the existing manhole cover structures are relatively simple and usually do not have the function of automatically adjusting the drainage volume according to the amount of water on the street. This limitation leads to the situation that in extreme weather conditions such as heavy rain, the urban drainage system cannot drain excess water in time and effectively, easily causing waterlogging, which seriously affects the urban traffic operation. For example, in some areas with low terrain or old drainage facilities, a large amount of precipitation in a short time will quickly accumulate on the road surface. Due to insufficient drainage capacity, the water level will rise rapidly, not only hindering the normal passage of vehicles and pedestrians, but even possibly submerging the foundation of surrounding buildings in severe cases, posing a threat to the safety of the building structure.

[0004] Although there are some intelligent manhole covers on the market that can be flipped and opened through remote control in order to increase the drainage volume in case of emergency, however, such technical solutions also expose obvious drawbacks in practical applications - the safety issue is particularly prominent. Especially in densely populated areas, if the manhole cover suddenly opens without sufficient warning, it is very likely to cause accidents where pedestrians accidentally fall and get injured. In addition, such manhole covers relying on external control means also have the risk of operation failure due to power supply interruption or control system failure, which will further reduce their practicability and reliability. Summary of the Invention

[0005] In view of this, the present invention provides a self-increasing drainage manhole cover, which can overcome the shortcomings that most of the existing manhole cover structures are relatively simple and usually do not have the function of automatically adjusting the drainage volume according to the amount of water on the street, and that the existing intelligent manhole covers have the risk of operation failure due to power supply interruption or control system failure.

[0006] The technical solution of the present invention is: a self-increasing drainage manhole cover, including a manhole seat and a manhole cover. The manhole cover is rotatably connected to the manhole seat, and a first drainage hole is opened on the manhole cover. It further includes a mounting plate, a blocking block, a fixing component and a lifting component. A plurality of second drainage holes are circumferentially spaced on the manhole cover. A mounting plate is arranged below the manhole cover, and a plurality of blocking blocks corresponding to the second drainage holes one by one are circumferentially spaced and connected to the mounting plate. The fixing component is arranged at the bottom of the manhole cover and is used to fix the position of the mounting plate. The lifting component is arranged inside the manhole seat and is used to drive the mounting plate to lift so that the blocking block can rise to block the second drainage hole.

[0007] Further, the fixing component includes a guiding rod, a first magnet and a second magnet. The guiding rod is connected to the bottom of the manhole cover. The first magnet is connected to the bottom of the manhole cover and is sleeved outside the guiding rod. The second magnet is slidably connected to the guiding rod. The second magnet is located directly below the first magnet and is fixedly connected to the mounting plate.

[0008] Further, the lifting component includes a fixing ring, a connecting pipe, a water-filled cylinder and a connecting spring. The fixing ring is connected to the inner side of the manhole seat, and a plurality of third drainage holes are circumferentially spaced on the fixing ring. The connecting pipe is connected to the bottom of the second magnet. The water-filled cylinder is connected to the bottom of the connecting pipe, and a plurality of fourth drainage holes are circumferentially spaced at the bottom of the water-filled cylinder. The connecting spring is arranged inside the connecting pipe, and both ends of the connecting spring are respectively connected to the bottom of the guiding rod and the inner bottom of the water-filled cylinder.

[0009] Further, the outer diameter of the water-filled cylinder is adapted to the inner diameter of the fixing ring, and the outer wall of the water-filled cylinder contacts the inner wall of the fixing ring.

[0010] Further, it further includes a baffle. Grooves are symmetrically opened on the blocking block. The baffle is placed on the top of the mounting plate, and the blocking block slidably penetrates through the baffle. Convex blocks are symmetrically arranged on the baffle, and the convex blocks slide in the grooves.

[0011] Further, it further includes an elastic membrane. Both ends of the elastic membrane are respectively connected to the top of the baffle and the bottom of the first magnet.

[0012] Further, it further includes a fixing rod and a net. The fixing rods are circumferentially spaced and connected to the bottom of the manhole cover, and the fixing rods penetrate through the first magnet and the second magnet. The net is connected to the lower end of the fixing rod, and the net is located inside the water-filled cylinder and contacts the inner wall of the water-filled cylinder.

[0013] Further, it further includes a clamping block and a reset spring. Slots are symmetrically opened on the inner wall of the connecting pipe. The clamping blocks are symmetrically slidably connected to the lower end of the guiding rod, and the clamping blocks are stuck in the slots. Both ends of the reset spring are respectively connected to the clamping block and the guiding rod.

[0014] The beneficial effects are as follows: 1. Through the first drainage hole and the second drainage hole on the manhole cover, as well as the precise cooperation among the mounting plate, the plug block and the lifting assembly, the present invention can realize the function of automatically adjusting the drainage volume according to the water volume in the street. Under normal circumstances, the plug block will block the second drainage hole to prevent sundries from entering. However, in extreme weather such as heavy rain, as the accumulated water in the water-filled cylinder increases and its weight exceeds the attractive force between the magnets, the plug block will descend to open the second drainage hole, thus significantly increasing the drainage capacity and effectively avoiding the occurrence of urban waterlogging.

[0015] 2. The present invention adopts a fixed assembly composed of a guide rod, a first magnet and a second magnet to work together with the lifting assembly, which can ensure the safety and reliability of the system. After the water volume decreases, due to the action of the connecting spring, the water-filled cylinder and the second magnet will drive the mounting plate to rise and reset, so that the plug block blocks the second drainage hole again. At the same time, the first magnet attracts the second magnet again to stabilize the position of the mounting plate. This design can not only avoid the risk of operation failure caused by power supply interruption or control system failure, but also reduce the possibility of pedestrians falling and being injured due to the sudden opening of the manhole cover.

[0016] 3. Through the cooperation of multiple components such as the baffle, the elastic membrane, the fixed rod and the net, during the movement of the plug block, the baffle and the elastic membrane can block sundries from entering the space between two adjacent plug blocks and the space between the first magnet and the second magnet. The net located inside the water-filled cylinder can effectively intercept large-particle sundries flowing in with the rainwater, ensuring unobstructed water flow. When the water-filled cylinder descends, the sundries on the top of the net can be washed away by the rainwater and smoothly discharged into the sewer through the gap between the fixed ring and the water-filled cylinder, further enhancing the self-cleaning ability of the system and reducing the maintenance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0018] Figure 2 It is an installation schematic diagram of the mounting plate, the plug block, the fixed assembly and the lifting assembly of the present invention.

[0019] Figure 3 It is another state schematic diagram of the mounting plate, the plug block, the fixed assembly and the lifting assembly of the present invention.

[0020] Figure 4 It is a specific structural schematic diagram of the water-filled cylinder and the connecting spring of the present invention.

[0021] Figure 5 It is an installation schematic diagram of the baffle and the elastic membrane of the present invention.

[0022] Figure 6 It is another state schematic diagram of the baffle and the elastic membrane of the present invention.

[0023] Figure 7 Schematic diagram of the separation structure of the mounting plate and the baffle plate of the present invention.

[0024] Figure 8 Schematic diagram of the installation of the fixing rod and the net barrier of the present invention.

[0025] Figure 9 Schematic diagram of the installation of the clamping block and the return spring of the present invention.

[0026] In the attached drawings: 1 - well seat, 2 - well cover, 3 - first drainage hole, 4 - second drainage hole, 5 - mounting plate, 6 - blocking block, 7 - guide rod, 8 - first magnet, 9 - second magnet, 10 - fixing ring, 11 - third drainage hole, 12 - connecting pipe, 13 - water filling cylinder, 14 - fourth drainage hole, 15 - connecting spring, 16 - groove, 17 - baffle plate, 1701 - convex block, 18 - elastic membrane, 19 - fixing rod, 20 - net barrier, 21 - clamping groove, 22 - clamping block, 23 - return spring. Detailed implementation manners

[0027] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the attached drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Embodiment: An automatic drainage-increasing drainage well cover, as Figures 1-4As shown in the figure, it includes a well seat 1, a well cover 2, a mounting plate 5, a blocking block 6, a fixing component and a lifting component. On the upper right side of the well seat 1, the well cover 2 is rotatably connected. The outer wall shape of the well cover 2 fits the inner wall shape of the well seat 1. On the left side of the top of the well cover 2, a first drainage hole 3 is opened. A plurality of second drainage holes 4 are also circumferentially spaced apart on the top of the well cover 2. Below the well cover 2, a mounting plate 5 is provided. A plurality of blocking blocks 6 are circumferentially spaced and connected to the mounting plate 5. The blocking blocks 6 correspond to the second drainage holes 4 one by one, and the blocking block 6 is located directly below its corresponding second drainage hole 4. The shape of the blocking block 6 is adapted to the shape of the second drainage hole 4. The lifting component is used to drive the mounting plate 5 to lift, so that the mounting plate 5 can drive the blocking block 6 to lift. When the blocking block 6 rises, it can block its corresponding second drainage hole 4. Subsequently, the position of the mounting plate 5 is fixed by the fixing component, which can prevent sundries such as stones and leaves from entering the second drainage hole 4. When encountering extreme weather conditions such as heavy rain, the fixing component will release the fixation of the mounting plate 5, so that the mounting plate 5 can drive the blocking block 6 to descend, so that the blocking block 6 no longer blocks the second drainage hole 4, and the rainwater can be discharged downward through the second drainage hole 4 into the sewer. In this way, the drainage volume of the well cover 2 can be automatically increased.

[0032] As Figure 2 and Figure 3 shown, the fixing component includes a guide rod 7, a first magnet 8 and a second magnet 9. In the middle of the bottom of the well cover 2, the guide rod 7 and the first magnet 8 are connected, and the first magnet 8 is sleeved on the outside of the upper end of the guide rod 7. A second magnet 9 is slidably connected to the guide rod 7. The second magnet 9 is located directly below the first magnet 8, and the second magnet 9 is fixedly connected to the mounting plate 5, so that the mounting plate 5 and the second magnet 9 can lift along the guide rod 7. When the second magnet 9 rises to contact the first magnet 8, the first magnet 8 can attract the second magnet 9 by magnetic force to fix the mounting plate 5.

[0033] As Figures 2-4 shown, the lifting component includes a fixing ring 10, a connecting pipe 12, a water-filled cylinder 13 and a connecting spring 15. The lower part of the inner wall of the well seat 1 is connected with the fixing ring 10, and a third drainage hole 11 is circumferentially spaced on the fixing ring 10. The bottom of the second magnet 9 is connected with the connecting pipe 12. The inner diameter of the connecting pipe 12 is larger than the outer diameter of the guide rod 7. The bottom of the connecting pipe 12 is connected with the water-filled cylinder 13. The material of the water-filled cylinder 13 is relatively soft, similar to rubber material, and a fourth drainage hole 14 is circumferentially spaced at the bottom of the water-filled cylinder 13. The outer diameter of the water-filled cylinder 13 is adapted to the inner diameter of the fixing ring 10, and the outer wall of the water-filled cylinder 13 contacts the inner wall of the fixing ring 10. A connecting spring 15 is arranged inside the connecting pipe 12, and both ends of the connecting spring 15 are respectively connected to the bottom of the guide rod 7 and the inner bottom of the water-filled cylinder 13.

[0034] Initially, the first magnet 8 attracts the second magnet 9 by magnetic force (as Figure 2As shown in the figure, ensure that the blocking block 6 can block the second drain hole 4 to prevent sundries such as stones and leaves from entering the second drain hole 4. First, install the well seat 1 and the manhole cover 2 at the designated positions. The rainwater on the road surface can flow downward through the first drain hole 3 to the top of the fixing ring 10 and inside the water-filled cylinder 13. The rainwater at the top of the fixing ring 10 and inside the water-filled cylinder 13 can respectively flow downward through the third drain hole 11 and the fourth drain hole 14 into the sewer. When encountering extreme weather conditions such as heavy rain, a large amount of rainwater will flow downward through the first drain hole 3 to the top of the fixing ring 10 and inside the water-filled cylinder 13. At this time, the drainage volume of the third drain hole 11 and the fourth drain hole 14 is less than the inflow volume at the first drain hole 3. Therefore, the rainwater will accumulate inside the water-filled cylinder 13, resulting in more and more rainwater inside the water-filled cylinder 13. When the weight of the rainwater contained in the water-filled cylinder 13 is greater than the magnetic force of mutual attraction between the first magnet 8 and the second magnet 9, the water-filled cylinder 13 will move downward due to gravity, causing the outer wall of the water-filled cylinder 13 to disengage from the inner wall of the fixing ring 10. The connecting spring 15 is stretched, and the water-filled cylinder 13 can drive the connecting pipe 12 and the second magnet 9 to move downward, causing the second magnet 9 to disengage from the first magnet 8, and the second magnet 9 can drive the mounting plate 5 and the blocking block 6 to move downward, so that the blocking block 6 no longer blocks the second drain hole 4 (as Figure 3 shown). In this way, the rainwater can be discharged to the lower part of the manhole cover 2 through the first drain hole 3 and the second drain hole 4, and can fall into the sewer through the gap between the fixing ring 10 and the water-filled cylinder 13. In this way, the drainage volume can be automatically increased. At this time, even if sundries such as stones and leaves enter the second drain hole 4, they will flow along with the rainwater and fall into the sewer, without causing blockage. When the rainwater on the road surface gradually decreases, the amount of rainwater discharged downward through the first drain hole 3 and the second drain hole 4 will gradually decrease, and the rainwater in the water-filled cylinder 13 can be slowly discharged downward through the fourth drain hole 14 into the sewer. As the rainwater in the water-filled cylinder 13 becomes less and less, when the weight of the rainwater contained in the water-filled cylinder 13 is less than the elastic force of the connecting spring 15, the connecting spring 15 will gradually return to its original state, driving the connecting pipe 12 and the water-filled cylinder 13 to move upward and reset. The water-filled cylinder 13 can drive the second magnet 9 to move upward and reset, and the second magnet 9 can drive the mounting plate 5 and the blocking block 6 to move upward and reset, so that the blocking block 6 re-blocks the second drain hole 4. At the same time, the second magnet 9 will contact the first magnet 8, and the first magnet 8 will attract the second magnet 9 by magnetic force to fix the positions of the mounting plate 5 and the blocking block 6. When the worker needs to enter the sewer for maintenance, the manhole cover 2 can be directly rotated upward to open. The manhole cover 2 can drive all the components on it to rotate upward and away from the well seat 1, so that the water-filled cylinder 13 is disengaged from the fixing ring 10, so that the worker can pass through the inside of the fixing ring 10 and enter the sewer.

[0035] As Figures 5-7As shown in the figure, it further includes a baffle 17 and an elastic membrane 18. Two grooves 16 are symmetrically formed on each plug 6. The baffle 17 is placed on the top of the mounting plate 5, and each plug 6 slidably penetrates through the baffle 17. A plurality of protrusions 1701 corresponding to the grooves 16 one by one are symmetrically provided on the baffle 17, and the protrusions 1701 slide in the corresponding grooves 16. An elastic membrane 18 is connected between the top of the baffle 17 and the bottom of the first magnet 8. Initially, the elastic membrane 18 is received between the baffle 17 and the first magnet 8. The top of the plug 6 protrudes from the top of the baffle 17, and the plug 6 can block the second drain hole 4 (as Figure 5 shown); when the plug 6 moves downward, the inner top of the groove 16 will gradually approach the top of the protrusion 1701. When the inner top of the groove 16 contacts the top of the protrusion 1701, the plug 6 will push the protrusion 1701 and the baffle 17 to move downward synchronously, and the elastic membrane 18 is stretched. At this time, the top of the plug 6 is flush with the top of the baffle 17 (as Figure 6 shown). The baffle 17 can block the space between two adjacent plugs 6, and the elastic membrane 18 can block the space between the first magnet 8 and the second magnet 9, so as to prevent sundries such as stones and leaves from remaining in the space between two adjacent plugs 6 and the space between the first magnet 8 and the second magnet 9.

[0036] As Figure 8 shown, it further includes a fixing rod 19 and a retaining net 20. A plurality of fixing rods 19 are circumferentially and spacedly connected to the middle of the bottom of the manhole cover 2, and each fixing rod 19 penetrates through the first magnet 8 and the second magnet 9. A retaining net 20 is connected between the lower ends of the plurality of fixing rods 19, and the retaining net 20 is located inside the water filling cylinder 13 and contacts the inner wall of the water filling cylinder 13. The top shape of the retaining net 20 is a conical surface. Initially, the retaining net 20 is located inside the water filling cylinder 13. When sundries such as stones and leaves enter the inside of the water filling cylinder 13 along with the rainwater, the retaining net 20 can block the sundries such as stones and leaves, so that the sundries such as stones and leaves stay on the top of the retaining net 20. When the water filling cylinder 13 moves downward, the inner bottom of the water filling cylinder 13 will gradually move away from the retaining net 20. When the top height of the retaining net 20 is higher than the top height of the water filling cylinder 13, under the washing of the rainwater, the sundries staying on the top of the retaining net 20 can fall downward into the sewer through the gap between the fixing ring 10 and the water filling cylinder 13, preventing the sundries from blocking the fourth drain hole 14.

[0037] As Figure 9As shown in the figure, it further includes a clamping block 22 and a return spring 23. Four clamping grooves 21 are symmetrically formed in the upper part of the inner wall of the connecting pipe 12. The lower ends of the guide rods 7 are symmetrically and slidably connected with four clamping blocks 22, and the clamping blocks 22 can be clamped in the clamping grooves 21 to limit the connecting pipe 12. A return spring 23 is connected between each clamping block 22 and the guide rod 7. Initially, the clamping block 22 is in contact with the inner wall of the connecting pipe 12, and the return spring 23 is in a compressed state. When the connecting pipe 12 moves downward, the clamping groove 21 will gradually approach the clamping block 22. When the clamping groove 21 is aligned with the clamping block 22, the return spring 23 will return to its original state, driving the clamping block 22 to pop out and be clamped in the clamping groove 21, so as to be able to limit the connecting pipe 12 and stabilize the position of the water filling cylinder 13. When the amount of rainwater in the water filling cylinder 13 changes slightly, it can prevent the connecting spring 15 from reciprocatingly stretching and reduce the fatigue degree of the connecting spring 15. When all the rainwater in the water filling cylinder 13 is discharged into the sewer, the connecting spring 15 will drive the connecting pipe 12 to move upward and reset, so that the clamping block 22 is separated from the clamping groove 21, and the inner wall of the connecting pipe 12 will squeeze the clamping block 22 to retract, so that the return spring 23 is compressed again.

[0038] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. An incrementally arranged drainage manhole cover, comprising a manhole seat (1) and a manhole cover (2), the manhole cover (2) is rotatably connected to the manhole seat (1), and a first drainage hole (3) is formed in the manhole cover (2); it is characterized in that, It further includes a mounting plate (5), a blocking block (6), a fixing component and a lifting component. A plurality of second drainage holes (4) are circumferentially spaced on the manhole cover (2). A mounting plate (5) is arranged below the manhole cover (2). A plurality of blocking blocks (6) corresponding to the second drainage holes (4) one by one are circumferentially spaced and connected on the mounting plate (5). The fixing component is arranged at the bottom of the manhole cover (2), and the fixing component is used to fix the position of the mounting plate (5). The lifting component is arranged inside the well seat (1), and the lifting component is used to drive the mounting plate (5) to lift, so that the blocking block (6) can rise to block the second drainage hole (4).

2. The self-incrementing and arranged drainage manhole cover according to claim 1, characterized in that, The fixing component includes a guide rod (7), a first magnet (8) and a second magnet (9). The guide rod (7) is connected to the bottom of the manhole cover (2). The first magnet (8) is connected to the bottom of the manhole cover (2), and the first magnet (8) is sleeved outside the guide rod (7). The second magnet (9) is slidably connected to the guide rod (7). The second magnet (9) is located directly below the first magnet (8), and the second magnet (9) is fixedly connected to the mounting plate (5).

3. The self-increasing and arranged drainage well cover according to claim 2, characterized in that, The lifting component includes a fixing ring (10), a connecting pipe (12), a water-filled cylinder (13) and a connecting spring (15). The fixing ring (10) is connected to the inner side of the well seat (1), and a plurality of third drainage holes (11) are circumferentially spaced on the fixing ring (10). The connecting pipe (12) is connected to the bottom of the second magnet (9). The water-filled cylinder (13) is connected to the bottom of the connecting pipe (12), and a plurality of fourth drainage holes (14) are circumferentially spaced at the bottom of the water-filled cylinder (13). The connecting spring (15) is arranged inside the connecting pipe (12), and the two ends of the connecting spring (15) are respectively connected to the bottom of the guide rod (7) and the inner bottom of the water-filled cylinder (13).

4. The self-increasing row type drainage well cover according to claim 3, characterized in that, The outer diameter of the water-filled cylinder (13) is adapted to the inner diameter of the fixing ring (10), and the outer wall of the water-filled cylinder (13) is in contact with the inner wall of the fixing ring (10).

5. The self-increasing and arranged drainage well cover according to claim 4, characterized in that, It further includes a baffle (17). Grooves (16) are symmetrically opened on the blocking block (6). The baffle (17) is placed on the top of the mounting plate (5), and the blocking block (6) slidably penetrates through the baffle (17). Protrusions (1701) are symmetrically arranged on the baffle (17), and the protrusions (1701) slide in the grooves (16).

6. The self-increasing and arranged drainage well cover according to claim 5, characterized in that It further includes an elastic membrane (18). The two ends of the elastic membrane (18) are respectively connected to the top of the baffle (17) and the bottom of the first magnet (8).

7. The self-increasing and arranged drainage well cover according to claim 6, characterized in that, It further includes a fixing rod (19) and a netting (20). The fixing rod (19) is circumferentially spaced and connected to the bottom of the manhole cover (2), and the fixing rod (19) penetrates through the first magnet (8) and the second magnet (9). The netting (20) is connected to the lower end of the fixing rod (19), and the netting (20) is located inside the water-filled cylinder (13) and is in contact with the inner wall of the water-filled cylinder (13).

8. The self-increasing row type drainage well cover according to claim 7, wherein, It further includes a clamping block (22) and a return spring (23). Clamping grooves (21) are symmetrically opened on the inner wall of the connecting pipe (12). The clamping block (22) is symmetrically slidably connected to the lower end of the guide rod (7), and the clamping block (22) is clamped in the clamping groove (21). The two ends of the return spring (23) are respectively connected to the clamping block (22) and the guide rod (7).

Images