Municipal sewer drainage seat

Abstract

The invention relates to the technical field of municipal drainage, in particular to a municipal sewer drainage seat. The municipal sewer drainage base comprises a drainage base body, a well lid is placed in the drainage base body, a plurality of arc-shaped drainage holes are formed in the top wall of the drainage base body, a plurality of anti-blocking holes are formed in the side, close to the arc-shaped drainage holes, of the inner wall of the well lid, and bolts evenly distributed in the circumferential direction are slidably connected to the inner side of the well lid; a drainage cover is connected between the evenly-distributed bolts in a threaded mode, and evenly-distributed compression springs are connected between the drainage cover and the well lid. Through the linkage design of a double drainage structure (arc-shaped holes and grid holes cooperate with anti-blocking holes) and a compression spring, the drainage efficiency and the anti-clogging capacity are remarkably improved; an automatic triggering type safety warning system is integrated, when the well lid is lost, the pneumatic mechanism drives the inflation warning piece to pop out, all-weather early warning is achieved in combination with sound-light alarm and a reflective mark, the response time is short, the reliability is high, and the protection performance of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal drainage, in particular to a municipal sewer drain seat. Background Art

[0002] The wellhead structure in the municipal drainage system is an important part of urban infrastructure. Its drainage seat is mainly used to cover the wellhead, guide the discharge of rainwater or sewage, and ensure the safety of pedestrians and vehicles.

[0003] However, traditional drain seats mostly use a simple cover plate and wellhead snap-on design, and their functions are concentrated on drainage efficiency and structural stability. They lack active protection mechanisms after the manhole cover is lost or stolen. In actual applications, manhole covers are easy to be illegally dismantled or accidentally displaced due to the high value of the material or poor fixation, resulting in the wellhead being exposed for a long time. Such problems are particularly prominent in rural areas. Due to insufficient lighting or weak supervision at night, exposed wellheads pose a serious risk of falling to pedestrians and vehicles, and may even cause casualties. Although existing technologies improve the stability of the cover body through locking devices (such as hinged covers and fixing bolts), they still cannot provide emergency protection functions when the cover body is completely lost.

[0004] Based on the above situation, there is an urgent need for a municipal sewer drain seat that can automatically trigger a protection mechanism when the manhole cover is missing to prevent people from falling. Summary of the Invention

[0005] In order to overcome the shortcomings of traditional manhole covers that, after being lost or stolen, the manhole is completely exposed and lacks emergency protection measures, resulting in the risk of pedestrians and vehicles falling, the technical problem to be solved is: to provide a municipal sewer drain seat.

[0006] The technical implementation scheme of the present invention is: a municipal sewer drain seat, including a drain seat, a manhole cover placed in the drain seat, a top wall of which is provided with multiple arc-shaped drainage holes, an inner wall of the manhole cover is provided with a plurality of anti-blocking holes on the side close to the arc-shaped drainage holes, the inner side of the manhole cover is slidingly connected with bolts evenly distributed along the circumference, a drain cover is threadedly connected between the evenly distributed bolts, and evenly distributed compression springs are connected between the drain cover and the manhole cover, which are respectively wound around adjacent bolts.

[0007] As an improvement to the above solution, the lower part of the inner wall of the drain seat is provided with positioning protrusions evenly distributed along the circumference, and a shielding member is slidably connected to the drain seat. The bottom of the shielding member is provided with a snap-on notch along the circumference for engaging with the positioning protrusions, and a plurality of circular drainage holes are provided on its side.

[0008] As an improvement of the above-mentioned scheme, a plurality of wedge blocks are arranged at equal intervals along the circumferential direction on the inner side of the bottom wall of the drain seat, a plurality of guide rods are fixedly connected to the inner side of the side wall of the drain seat at equal intervals along the circumferential direction, annular brackets are slidably connected between the plurality of guide rods, and reset springs are connected between the annular brackets and the guide rods, and each reset spring is respectively wound around an adjacent guide rod, and the inner side of the annular bracket is fixedly connected with evenly distributed air storage parts along the circumferential direction, and exhaust parts are slidably connected therein, and tension springs are connected between the exhaust parts and adjacent air storage parts, which are respectively wound around adjacent exhaust parts and are always in a stretched state, and the evenly distributed air storage parts are provided with air supply pipes, and their ends are provided with foldable inflation warning parts, and a pressure frame is slidably connected to the top wall of the shielding part, and its bottom is in contact with the top of the annular bracket.

[0009] As an improvement to the above solution, a roller is provided at the bottom of the exhaust member, which contacts the lower part of the top inclined surface of the adjacent wedge block.

[0010] As an improvement to the above solution, the press frame is provided with symmetrically distributed latches, and the symmetrically distributed latches are all provided with guiding inclined surfaces.

[0011] As an improvement of the above-mentioned solution, the square window on the shielding member is rotatably connected to a flip limit member, and the top wall of the shielding member is rotatably connected to an arc-shaped blocking rod on the side close to the square window, and each blocking rod is provided with a button hole, and the flip limit member is provided with a button head matching the button hole, and a torsion spring is connected between each blocking rod and the shielding member, which is respectively wound around the adjacent blocking rod and always maintains a twisted state.

[0012] As an improvement to the above solution, the evenly distributed blocking bars are each provided with a card slot inside and a card block matching the card slot outside.

[0013] As an improvement to the above solution, the buckles on the blocking rods are respectively provided with locking pins, which are connected to the adjacent blocking rods with linear springs, and the linear springs are respectively wound around the adjacent locking pins.

[0014] As an improvement to the above solution, the tops of the evenly distributed gas storage components are fixed with lifting components, on which are provided limiting brackets. The gas pipes pass through adjacent gas storage components, and the inflation warning component is located in the limiting brackets.

[0015] As an improvement to the above-mentioned solution, the inner wall of the manhole cover is fixed with evenly distributed support plates along the circumferential direction, on which elastic airbags are fixed, and each airbag is installed with an air inlet valve, and the tops of the evenly distributed airbags are fixed to the inner side of the drain cover; the airbags and the adjacent air storage parts are connected by flexible air guide tubes, which pass through the adjacent support plates, and the symmetrically distributed air storage parts are installed with pressure relief valves.

[0016] The beneficial effects are: the present invention significantly improves drainage efficiency and anti-clogging ability through the dual drainage structure (arc holes and grid holes cooperate to prevent blocking holes) and compression spring linkage design; the integrated automatic trigger safety warning system drives the inflatable warning part to pop out through the pneumatic mechanism when the manhole cover is missing, and combines the sound and light alarm with the reflective mark to achieve all-weather early warning, with short response time and high reliability, thereby improving the protection performance of the device.

[0017] The present invention triggers the automatic deployment of the blocking rod by flipping the limit piece to form a high-load-bearing interlocking protection net, which quickly builds a physical barrier when the manhole cover is lost and effectively intercepts falling people or objects. The combined design of the card slot-card block interlocking allows the four blocking rods to form an overall frame structure, which greatly improves the bearing capacity. The quick unlocking mechanism composed of a locking pin and a linear spring can be manually unlocked by one person and fix the blocking rod to an open state, realizing convenient switching of the maintenance channel, and having both warning and physical protection functions, which significantly reduces the risk of wellhead exposure.

[0018] The present invention utilizes the pressure generated when vehicles or pedestrians pass over the drain cover to continuously replenish gas into the gas storage component, so that after the manhole cover is lost, the inflatable warning component can be quickly extended from the wellhead with the support of sufficient gas, playing an effective warning role and improving the protection performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the manhole cover, bolts, drain cover and other components of the present invention.

[0021] Figure 3 It is a sectional view of the three-dimensional structure of the wedge block, air storage component, return spring and other components of the present invention.

[0022] Figure 4 This is a sectional view of the three-dimensional structure of the shielding member, latch, pressure frame and other components of the present invention.

[0023] Figure 5 This is a sectional view of the three-dimensional structure of the gas storage component, tension spring, exhaust component and other components of the present invention.

[0024] Figure 6 It is a sectional view of the three-dimensional structure of the components such as the rollover limiter, the blocking rod and the locking pin of the present invention.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the shielding member, torsion spring, linear spring and other components of the present invention.

[0026] Figure 8 It is a sectional view of the three-dimensional structure of the airbag, air guide tube, support plate and other components of the present invention.

[0027] Figure 9 It is a schematic diagram of the three-dimensional structure of the gas storage component, gas guide pipe, pressure relief valve and other components of the present invention.

[0028] Among them, the above-mentioned drawings include the following figure marks: 1_drain seat, 11_manhole cover, 1101_bolt, 12_drain cover, 13_compression spring, 14_wedge block, 15_air storage part, 151_tension spring, 152_lifting part, 153_reset spring, 154_exhaust part, 155_pressure relief valve, 16_air pipe, 17_inflation warning part, 18_latch, 19_shielding part, 110_guide rod, 111_ring-shaped bracket, 112_pressure frame, 2_flip limit part, 21_locking pin, 22_linear spring, 23_torsion spring, 24_blocking rod, 3_air bag, 31_air guide pipe, 32_support plate. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: Refer to the attached Figure 1-2 The closure 11 is provided with a plurality of holes for preventing water from being blocked, so that the closure 11 can be easily opened and closed, thereby effectively reducing the risk of blockage.

[0031] When installing the road manhole cover 11, first clear away obstacles such as gravel and garbage around the manhole, ensure that the working surface is clean to reduce construction interference, vertically embed the drain seat 1 into the manhole, and fix it with bolts 1101 or clips to ensure that the gap between it and the manhole wall does not exceed 3mm. Then backfill the asphalt concrete in layers, control the thickness of each layer within 3cm, and use a rammer to compact it layer by layer to ensure that the density reaches more than 95%; after backfilling to about 2cm above the road surface, place the manhole cover 11 vertically in the drain seat 1, and use the stepped structure to accurately embed it to ensure that the manhole cover 11 completely covers the manhole and the surface height difference does not exceed 3mm.

[0032] A 10cm gap is left around the manhole cover 11, which is then manually filled with fine-grained asphalt concrete to prevent deformation caused by direct mechanical rolling. A protective layer is also applied to prevent asphalt contamination of the manhole cover 11's surface. Finally, a roller is used to roll the manhole cover 11 from the edge toward the center, ensuring that the manhole cover 11 forms a continuous surface with the road surface, with a flatness error within 3mm. Traffic is then released after the asphalt cools to room temperature (4-6 hours) to prevent unconsolidated material from being carried away by wheels.

[0033] During rainy weather, the curved drainage holes in manhole cover 11 and the gridded holes in drain cover 12 work together to drain accumulated water from the road into the sewer. Because trees often grow along roadsides, rainwater can wash leaves and other debris toward the manhole opening. These debris are intercepted by the gridded holes in drain cover 12, preventing them from entering the sewer and causing blockage. If there are a large number of leaves or debris, they may partially block the curved drainage holes in both manhole cover 11 and drain cover 12, compromising drainage efficiency.

[0034] At this point, if a vehicle or pedestrian passes over drain cover 12, it moves downward relative to manhole cover 11, causing compression spring 13 to deform, allowing the accumulated water to drain into the well through the anti-blocking hole. When the pedestrian or vehicle leaves, the spring 13 automatically resets drain cover 12. This process repeats as vehicles continue to pass over the well, ensuring that accumulated water can be efficiently drained into the wellhead.

[0035] As described in the background, when a manhole cover 11 is exposed for an extended period due to illegal removal or accidental displacement, the exposed wellhead poses a serious falling risk to pedestrians and vehicles. Failure to promptly protect the exposed wellhead could lead to a safety incident, resulting in casualties or property damage. Therefore, this embodiment automatically pops up a warning device within the exposed wellhead when the manhole cover 11 is lost or stolen, proactively alerting pedestrians and vehicles, thereby mitigating safety risks and providing effective protection.

[0036] Reference Attachment Figure 3-5The specific plan is as follows: the lower part of the inner wall of the drain seat 1 is provided with positioning protrusions evenly distributed along the circumferential direction, and a shielding member 19 is slidably connected to the drain seat 1. The bottom of the shielding member 19 is provided with a bayonet that engages with the positioning protrusions along the circumferential direction, limiting the shielding member 19 to slide only along the axial direction, thereby preventing the occurrence of rotational offset. At the same time, a cavity can be formed between the outer wall of the shielding member 19 and the inner wall of the drain seat 1. The cavity is used to install a warning device. A plurality of circular drainage holes are provided on the side wall of the shielding member 19. If accumulated water flows into the cavity, it can be discharged through the circular drainage holes to avoid water accumulation in the cavity.

[0037] Under normal conditions, manhole cover 11 is installed on drain base 1, shielding member 19 is located at a lower position inside drain base 1, and the warning device is in standby mode. At this time, the cooperation between the positioning protrusion and the latch ensures that shielding member 19 is stable and immobile, preventing external factors (such as garbage and leaves) from entering the cavity and affecting the normal operation of the warning device.

[0038] When the manhole cover 11 is exposed due to illegal disassembly or accidental displacement, the warning device will automatically start to remind pedestrians and vehicles to pay attention to safety through sound and light alarms, inflation alarms, etc., thereby effectively reducing safety hazards and providing protective measures.

[0039] If the warning device fails to start in time, when the staff needs to inspect and repair the faulty warning device, the shielding member 19 can be vertically removed from the drain seat 1 to directly inspect and repair the warning device.

[0040] A plurality of wedge blocks 14 are arranged at equal intervals along the circumferential direction on the inner side of the bottom wall of the drain seat 1, and a plurality of guide rods 110 are fixedly connected to the inner side of the side wall of the drain seat 1 at equal intervals along the circumferential direction. An annular bracket 111 is slidably connected between the plurality of guide rods 110, and a return spring 153 is connected between the annular bracket 111 and the guide rod 110, and each return spring 153 is respectively wound around the adjacent guide rod 110, and the inner side of the annular bracket 111 is fixedly connected with a uniformly distributed air storage member 15 along the circumferential direction, and an exhaust member 154 is slidably connected therein, and the bottom of the exhaust member 154 is in contact with the lower part of the top inclined surface of the adjacent wedge block 14, and a tension spring 151 is connected between the exhaust member 154 and the adjacent air storage member 15, which is respectively wound around the adjacent exhaust member 154 and is always in a stretched state. The uniformly distributed air storage members 15 are each provided with an air supply pipe 16, and their ends are each provided with a foldable inflation warning member 17.

[0041] The top wall of the shielding member 19 is provided with evenly distributed square windows along the circumference. When the inflatable warning member 17 extends upward, it can be drilled out from the square windows. A pressure frame 112 is slidably connected to the top wall of the shielding member 19, and its bottom is in contact with the top of the annular bracket 111. Under normal conditions, when the manhole cover 11 is placed vertically in the drain seat 1, the manhole cover 11 will be pressed on the pressure frame 112, and the pressure frame 112 will act on the annular bracket 111, so that the reset spring 153 is always in a stretched state.

[0042] When the manhole cover 11 is illegally dismantled or accidentally lost, the pressure frame 112 loses its restraining force on the manhole cover 11. Under the elastic force of the return spring 153, the annular bracket 111 drives the gas storage member 15 and the pressure frame 112 to move upward, thereby driving the exhaust member 154 to move upward synchronously. At this time, the top inclined surface of the wedge block 14 no longer presses against the exhaust member 154. Subsequently, under the elastic force of the tension spring 151, the exhaust member 154 slides into the gas storage member 15, compressing the gas in the gas storage member 15, causing the pressure in the gas storage member 15 to increase. The compressed gas is passed through the gas pipe 16 into the inflation warning member 17. The inflation warning member 17 is expanded by the input gas and extends upward to drill out from the square window and finally extends out of the wellhead.

[0043] To further enhance the warning effect, a pressure sensor can be installed within the inflatable warning element 17. When the inflatable warning element 17 is inflated to a certain limit, it triggers an external sound and light alarm device to sound an alarm. Furthermore, a reflective strip is provided on the outside of the inflatable warning element 17, making it clearly visible even at night or in low-light conditions. Therefore, when the inflatable warning element 17 protrudes from the ground, drivers in moving vehicles or pedestrians can notice the protrusion at the wellhead from a distance, receive a timely warning, and avoid the wellhead, effectively reducing safety hazards.

[0044] The exhaust member 154 is equipped with a roller at its base. When the manhole cover 11 is lost, exposing the wellhead, the exhaust member 154 rapidly activates under the combined action of the tension spring 151 and the return spring 153, compressing the gas within the gas storage member 15. The roller's primary function is to reduce friction between the exhaust member 154 and the wedge block 14, ensuring that the exhaust member 154 is unaffected by friction during the gas compression process, allowing it to quickly respond and complete its action. This design effectively improves the system's sensitivity and reliability, ensuring that the warning device can be quickly activated and issue a timely warning signal when the manhole cover 11 is lost.

[0045] During the installation of the manhole cover 11, the drain base 1 and the shielding member 19 must first be assembled into a single unit and vertically inserted into the manhole. At this point, the manhole cover 11 has not yet been placed into the drain base 1, so the pressure frame 112 is in an unconstrained state. To prevent the inflatable warning member 17 from malfunctioning and sounding an alarm, the pressure frame 112 must be pre-locked to maintain its position, applying pressure to the ring-shaped support 111.

[0046] Specifically, the pressure frame 112 is provided with symmetrically distributed latches 18, and a socket is opened on the inner wall of the drain seat 1 near the latch 18. When the position of the pressure frame 112 needs to be fixed, the latch 18 can be pushed into the socket, and the pressure frame 112 and the drain seat 1 are connected by the latch 18.

[0047] The symmetrically distributed latches 18 are all provided with guiding slopes. When the manhole cover 11 is precisely embedded in the drain seat 1 in a stepped structure, the bottom of the manhole cover 11 will press on the guiding slopes of the latches 18, forcing the latches 18 to slide inward until they are withdrawn from the socket, thereby releasing the locked state. At this time, the pressure frame 112 is only constrained by the gravity of the manhole cover 11. Once the manhole cover 11 is removed due to illegal disassembly or accidental loss, the pressure frame 112 will no longer press the annular bracket 111 due to the loss of its constraint. Subsequently, under the elastic force of the reset spring 153, the inflatable warning member 17 can be smoothly activated and extended out of the wellhead, completing the warning function.

[0048] After the manhole cover 11 is lost, even though the inflatable warning member 17 can be deployed and sound an alarm in time, pedestrians or vehicles may still fall into the manhole due to various factors. Specifically, at night or in low-light conditions, insufficient light may prevent the reflective warning device from being noticed in time; inclement weather such as fog and heavy rain can reduce visibility and affect recognition; distraction (such as using a mobile phone or talking) can also cause the presence of the warning device to be ignored; in special scenarios, the sound and light alarm may be masked by ambient noise or insufficient height, weakening the warning effect; and when the warning device is discovered, the distance is too close, making it difficult to avoid it.

[0049] This embodiment requires that an automatic blocking mechanism be provided in the exposed wellhead, which can be quickly deployed when the well cover 11 is lost or removed, forming a physical barrier to prevent people or objects from falling into the well.

[0050] Reference Attachment Figure 6-7 This embodiment employs the following technical solution: A flip stopper 2 is rotatably connected to the square window on the shielding member 19. This flip stopper 2 is used to prevent debris such as leaves from entering the cavity, thereby preventing interference with the normal operation of the warning device. A curved blocking rod 24 is rotatably connected to the top wall of the shielding member 19 on the side near the square window. Each blocking rod 24 is provided with a buttonhole; correspondingly, the flip stopper 2 is provided with a button head that matches the buttonhole. Furthermore, a torsion spring 23 is connected between each blocking rod 24 and the shielding member 19. It is wound around the adjacent blocking rod 24 and remains in a twisted state.

[0051] If the manhole cover 11 is illegally dismantled or accidentally lost, the inflatable warning member 17 will be inflated by gas and extend upward. As it extends from the square window, it will push the flip limiter 2 upward, causing it to flip inward. Subsequently, the buckle on the flip limiter 2 will flip over and no longer lock the eye on the blocking rod 24. At this time, under the elastic force of the torsion spring 23, the blocking rod 24 will deflect inward, and multiple blocking rods 24 will span the wellhead, forming a physical barrier. If someone accidentally falls into the wellhead, the horizontal blocking rod 24 can effectively catch the falling person, preventing the risk of them falling directly into the well.

[0052] To improve the overall load-bearing capacity of the barrier bars 24 spanning the wellhead, a special design was developed: evenly distributed barrier bars 24 are each provided with internal slots and externally with matching blocks. When a barrier bar 24 deflects inward, the blocks on one bar engage the slots of an adjacent barrier bar 24.

[0053] For example, when there are four barrier bars 24, the block on the right barrier bar 24 inserts into the slot on the upper barrier bar 24; the block on the upper barrier bar 24 inserts into the slot on the left barrier bar 24; the block on the left barrier bar 24 inserts into the slot on the lower barrier bar 24; and the block on the lower barrier bar 24 inserts into the slot on the right barrier bar 24. Through the interaction of these blocks and slots, the four barrier bars 24 are connected into a single structure, significantly increasing their load-bearing capacity. If someone accidentally falls into the wellhead, the connected barrier bars 24 can more effectively catch them, thus preventing an accident.

[0054] In the alert state, if workers need to go down the well for inspection or maintenance, the barrier bars 24 lying across the wellhead may block their normal passage. Therefore, a mechanism is needed to allow the barrier bars 24 to be pushed outward and temporarily locked, thereby re-exposing the wellhead and facilitating entry. Specifically, the buckles of the barrier bars 24 are each equipped with a locking pin 21, and a linear spring 22 is connected between each of the adjacent barrier bars 24. The linear springs 22 are each wound around the adjacent locking pin 21 to provide elastic support.

[0055] When the staff needs to deflect and lock the blocking rod 24 outward: first, pull the locking pin 21 upward so that it no longer presses against the blocking rod 24. At this time, the linear spring 22 will be stretched; then, manually move the blocking rod 24 outward to the appropriate position; finally, release the locking pin 21. Under the elastic force of the linear spring 22, the locking pin 21 will slide downward and reset, and press against the blocking rod 24 again, thereby fixing it in its current position, thereby exposing the space at the wellhead again, providing sufficient passage conditions for the staff to go down the well for inspection or maintenance operations.

[0056] Example 2: Refer to the attached Figure 8-9 If the inflatable warning member 17 needs to be extended from the square window due to the loss of the manhole cover 11, directly lifting the flip stopper 2 by the inflatable warning member 17 may hinder the extension speed of the inflatable warning member 17 due to the gravity of the flip stopper 2. Therefore, in order to ensure that the inflatable warning member 17 can be extended from the square window quickly and smoothly, an auxiliary mechanism is needed to optimize its operation process.

[0057] Specifically, the tops of the evenly distributed gas storage members 15 are all fixed with lifting members 152, on which are all provided with limiting brackets. The gas delivery pipe 16 passes through the adjacent gas storage member 15, and the inflation warning member 17 is located in the limiting bracket so that it extends axially during inflation.

[0058] When the manhole cover 11 is illegally dismantled or accidentally lost, the gas storage part 15 moves upward with the annular bracket 111. At the same time, the lifting part 152 moves upward accordingly and preferentially pushes open the flip limit part 2 to fully open the square window; as the exhaust part 154 slides toward the inside of the gas storage part 15, the gas in the gas storage part 15 is gradually compressed and enters the inflation warning part 17 through the gas pipe 16. During this process, the inflation warning part 17 gradually expands due to gas filling and can be smoothly extended from the opened square window without hindrance.

[0059] This embodiment uses the lifting member 152 to allow the inflation warning member 17 to extend quickly and smoothly from the square window during the inflation process, effectively avoiding the problem of limited extension speed due to the gravity of the flip limit member 2, thereby improving the response efficiency and reliability of the overall device.

[0060] During operation of the inflation warning device, gas may leak from certain areas within the gas reservoir 15, resulting in insufficient gas support for the inflation warning member 17, thereby affecting the normal operation of the entire warning device and even causing the warning function to fail. Therefore, this embodiment designs a gas replenishment mechanism to ensure that sufficient gas pressure is always maintained within the gas reservoir 15.

[0061] Specifically, the inner wall of the manhole cover 11 is fixedly connected to uniformly distributed support plates 32 along the circumference, on which elastic airbags 3 are fixed. Each airbag 3 is equipped with an air inlet valve, and the tops of the uniformly distributed airbags 3 are fixed to the inner side of the drain cover 12. The airbags 3 are connected to the adjacent air storage parts 15 through flexible air guide tubes 31, which pass through the adjacent support plates 32. The air guide tubes 31 have sufficient length margin to ensure that the manhole cover 11 can be freely removed from the drain seat 1 when the warning device in the cavity needs to be inspected. The symmetrically distributed air storage parts 15 are all equipped with pressure relief valves 155 for releasing excess gas.

[0062] When a vehicle or pedestrian passes over drain cover 12, it moves downward relative to manhole cover 11, deforming compression spring 13. The downward movement of drain cover 12 applies pressure to elastic airbag 3, causing it to collapse. The gas within the collapsed airbag 3 is then transferred to air reservoir 15 via air duct 31. When the pedestrian or vehicle leaves, drain cover 12 automatically returns to its original position under the elastic force of compression spring 13, and airbag 3 returns to its original position.

[0063] External air re-enters the airbag 3 through the intake valve, causing it to inflate. As the vehicle continues to roll over, the above process repeats, and the air reservoir 15 is continuously replenished with air. When the air reservoir 15 is full, the excess air inside is released to the outside through the pressure relief valve 155.

[0064] This embodiment utilizes the pressure generated when vehicles or pedestrians pass over the drain cover 12 to continuously replenish gas into the gas storage member 15, so that after the manhole cover 11 is lost, the inflatable warning member 17 can be quickly extended from the wellhead with the support of sufficient gas, thereby playing an effective warning role and improving the protection performance of the device.

[0065] While the present disclosure has been described with respect to only a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that numerous other embodiments can be devised without departing from the scope of the invention. Accordingly, the scope of the present invention should be limited only by the claims appended hereto.

Claims

1. A municipal sewer drain seat, comprising a drain seat (1), a manhole cover (11) placed in the drain seat (1), a top wall of which is provided with a plurality of arc-shaped drainage holes, and an inner wall of the manhole cover (11) is provided with a plurality of anti-blocking holes on a side close to the arc-shaped drainage holes, characterized in that: Bolts (1101) uniformly distributed along the circumference are slidably connected to the inner side of the manhole cover (11), a drain cover (12) is threadedly connected between the uniformly distributed bolts (1101), and uniformly distributed compression springs (13) are connected between the drain cover (12) and the manhole cover (11), which are respectively wound around adjacent bolts (1101).

2. A municipal sewer drain seat according to claim 1, characterized in that: The lower portion of the inner wall of the drain seat (1) is provided with positioning protrusions evenly distributed along the circumference, and a shielding member (19) is slidably connected to the drain seat (1). The bottom of the shielding member (19) is provided with a bayonet that engages with the positioning protrusions along the circumference, and a plurality of circular drainage holes are provided on the side thereof.

3. A municipal sewer drain seat according to claim 2, characterized in that: The inner side of the bottom wall of the drain seat (1) is provided with a plurality of wedge blocks (14) at equal intervals along the circumferential direction, the inner side of the side wall of the drain seat (1) is fixed with a plurality of guide rods (110) at equal intervals along the circumferential direction, annular brackets (111) are slidably connected between the plurality of guide rods (110), and a return spring (153) is connected between the annular bracket (111) and the guide rods (110), each return spring (153) is respectively wound around an adjacent guide rod (110), and the inner side of the annular bracket (111) is fixed with uniformly distributed storage springs along the circumferential direction. The gas parts (15) are all slidably connected with exhaust parts (154), and tension springs (151) are connected between the exhaust parts (154) and the adjacent gas storage parts (15). The tension springs (151) are respectively wound around the adjacent exhaust parts (154) and are always in a stretched state. The evenly distributed gas storage parts (15) are all provided with gas pipes (16), and the ends of the gas storage parts (15) are all provided with foldable inflation warning parts (17). The top wall of the shielding part (19) is slidably connected with a pressure frame (112), and its bottom is in contact with the top of the ring-shaped bracket (111).

4. A municipal sewer drain seat according to claim 3, characterized in that: The bottom of the exhaust member (154) is provided with a roller, which contacts the lower part of the top inclined surface of the adjacent wedge block (14).

5. A municipal sewer drain seat according to claim 4, characterized in that: The pressing frame (112) is provided with symmetrically distributed latches (18), each of which is provided with a guiding inclined surface.

6. A municipal sewer drain seat according to claim 5, characterized in that: The square window on the shielding member (19) is rotatably connected to a flip limiter (2); the top wall of the shielding member (19) is rotatably connected to an arc-shaped blocking rod (24) on the side close to the square window, and each blocking rod (24) is provided with a button hole, and the flip limiter (2) is provided with a button head matching the button hole, and each blocking rod (24) and the shielding member (19) are connected with a torsion spring (23), which is respectively wound around the adjacent blocking rod (24) and always maintains a twisted state.

7. A municipal sewer drain seat according to claim 6, characterized in that: The evenly distributed blocking rods (24) are all provided with card slots inside and card blocks matching the card slots outside.

8. A municipal sewer drain seat according to claim 7, characterized in that: The buckles on the blocking rods (24) are respectively provided with locking pins (21), and linear springs (22) are connected between the buckles and the adjacent blocking rods (24), and the linear springs (22) are respectively wound around the adjacent locking pins (21).

9. A municipal sewer drain seat according to claim 8, characterized in that: The tops of the evenly distributed gas storage components (15) are all fixed with lifting components (152), on which are all provided limiting brackets. The gas delivery pipes (16) pass through the adjacent gas storage components (15), and the inflation warning components (17) are located in the limiting brackets.

10. A municipal sewer drain seat according to claim 9, characterized in that: The inner wall of the manhole cover (11) is fixedly connected to uniformly distributed support plates (32) along the circumferential direction, and elastic air bags (3) are fixedly connected thereto. Each air bag (3) is equipped with an air inlet valve, and the tops of the uniformly distributed air bags (3) are fixedly connected to the inner side of the drainage cover (12); the air bags (3) are connected to the adjacent air storage parts (15) through flexible air guide tubes (31), which pass through the adjacent support plates (32), and the symmetrically distributed air storage parts (15) are equipped with pressure relief valves (155).

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