Well lid device capable of being quickly detached

Abstract

According to the well lid device capable of being rapidly disassembled, a well lid body can be easily rotated to be opened and locked to be closed through a rotating pin mechanism, the disassembling and assembling process is simplified, the working efficiency is greatly improved, and the well lid device can be rapidly disassembled through sliding fit of a plug pin and a plug pin rod and assistance of a spring. By means of the arrangement of the diagonal planes of the bolt rods, it is guaranteed that the bolt rods can be smoothly pushed when the installation inner cover is installed, rapid fixing is achieved, by means of the rotary connection arrangement of the rotary pin mechanism, opening and closing of the well lid body are more convenient and rapid, complex tools and professional skills are not needed, the operation difficulty is reduced, and the well lid is more convenient to use. The installation inner cover not only provides additional support for the well lid body, but also achieves real-time monitoring of the state of the well lid through the built-in pressed bag and expansion bag structure, the upper top film can automatically bulge to play a warning role, and safety of pedestrians and vehicles is ensured.

Description

Technical Field

[0001] The present invention relates to the field of urban infrastructure, and more particularly to a quickly detachable manhole cover device. Background Art

[0002] The quick-detachable manhole cover device is an innovative manhole cover device designed to improve the efficiency of manhole cover maintenance and repair. Unlike traditional manhole covers, this device uses a convenient disassembly mechanism, which is usually achieved through specialized tools or automated systems. Its setting takes into account the operational convenience of maintenance personnel, so that the manhole cover can be removed quickly and safely when it needs to be inspected, repaired or cleaned, reducing the time and labor intensity required in the traditional manhole cover removal process. In addition, this device is usually made of lightweight materials such as aluminum alloy or high-strength plastic, making the disassembly process easier and less likely to cause worker injuries.

[0003] This type of manhole cover has important applications in urban infrastructure, especially in areas with heavy traffic or frequent construction. Its design not only takes convenience into account, but also takes into account durability and theft resistance, ensuring that it will not suffer serious damage during long-term use, while also avoiding the theft risks associated with traditional manhole covers. To enhance safety, quick-release manhole covers are often equipped with a locking system to prevent unauthorized removal. With these features, quick-release manhole covers can effectively improve the maintenance efficiency of urban pipeline facilities and ensure the smooth operation of infrastructure.

[0004] Traditional sewage manhole covers mostly use fixed connection methods and welding. This connection method is cumbersome and time-consuming when the manhole cover needs to be maintained or replaced. Especially in heavy traffic or emergency situations, quick disassembly and installation of the manhole cover is particularly important. The existing sewage manhole cover is a fixed part and the manhole cover in one. If it is damaged, it needs to be replaced as a whole, resulting in increased material costs. When replacing the sewage manhole cover, the asphalt around the sewage manhole cover needs to be scraped off before the manhole cover can be removed, which prolongs the working time, affects labor costs, and affects the passage of vehicles in heavy traffic, affecting traffic.

[0005] Therefore, in response to the above technical problems, it is necessary to provide a quickly detachable manhole cover device. Summary of the Invention

[0006] The object of the present invention is to provide a quickly detachable manhole cover device to solve the above-mentioned problems.

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by one embodiment of the present invention is as follows:

[0008] The quickly detachable manhole cover device includes a fixing seat and an installed inner cover, a manhole cover body is installed in the middle of the upper end of the fixing seat, a turn pin mechanism is fixedly connected to the outer side of the upper end of the fixing seat, and the turn pin mechanism is fixedly connected to the manhole cover body, the turn pin mechanism includes a fixing seat, the fixing seat is fixedly connected to the outer side of the upper end of the fixing seat, a turn pin seat is installed on the upper end of the fixing seat, a turn pin groove is opened on the turn pin seat near one end of the manhole cover body, a turn pin plate is rotatably connected to the inner end of the turn pin groove, and the turn pin plate is fixedly connected to the manhole cover body, the installed inner cover is installed at the inner end of the fixing seat, and the installed inner cover is located at the lower end of the manhole cover body, the installed inner cover includes a grid plate, the grid plate is installed at the inner end of the fixing seat, the outer end of the grid plate is fixedly connected to the outer ring plate, and the outer ring plate fits the inner wall of the fixing seat.

[0009] As a further improvement of the present invention, the installed inner cover also includes a liquid storage tank, which is opened inside the grid plate, and the upper end of the liquid storage tank is fixedly connected to a pressure bag, the upper end of the outer ring plate is opened, and the lower inner wall of the installation groove is fixedly connected to an expansion bag, the upper end of the expansion bag is fixedly connected to an upper top membrane, and the expansion bag and the upper top membrane are an integrated structure, and the grid plate is opened with a plurality of connecting holes near one end of the grid plate, and the connecting holes are respectively connected to the expansion bag and the liquid storage tank.

[0010] As a further improvement of the present invention, the installation inner cover also includes a one-way valve, and the one-way valve is installed on the inner wall of the communicating hole.

[0011] As a further improvement of the present invention, the installed inner cover also includes a second spring, and the inner wall of the connecting hole is provided with a pull-out groove matching the one-way valve. The second spring is installed in the pull-out groove, and the upper end of the grid plate is provided with a traction hole, and the traction hole is connected to the pull-out groove. A traction wire is provided in the traction hole, and the lower end of the traction wire is fixedly connected to the one-way valve.

[0012] As a further improvement of the present invention, the installation inner cover also includes a pull ring, and the upper inner wall of the traction hole is provided with a receiving groove. The pull ring is installed in the receiving groove, and the pull ring is fixedly connected to the upper end of the traction wire.

[0013] As a further improvement of the present invention, the liquid storage bin and the expansion bladder are both filled with fluorescent liquid, and the expansion bladder and the upper top membrane are both made of elastic wear-resistant material.

[0014] As a further improvement of the present invention, an oil film is provided at the outer end of the expansion bladder, and a plurality of frosted particles are provided at the upper end of the upper top membrane.

[0015] As a further improvement of the present invention, the rotation pin mechanism also includes two pairs of pins, and two pairs of sockets are provided on the upper ends of the fixing seat and the rotation pin seat. The two pairs of pins are respectively slidably connected to the two pairs of sockets. The fixing seat is provided with a pair of pin grooves at one end close to the installation inner cover, and a pin rod is slidably connected to the pin groove. A horizontal through hole matching the pin rod is provided in the middle of the pin, and a pair of vertical through holes matching the pin is provided in the middle of the pin rod.

[0016] As a further improvement of the present invention, the upper end of the latch rod close to the mounting inner cover is in the shape of a bevel.

[0017] As a further improvement of the present invention, the rotating pin mechanism also includes a limit groove, which is opened on the inner wall of the pin groove. A limit ring is slidably connected in the limit groove, and the limit ring is fixedly connected to the outer end of the pin rod. A first spring is fixedly connected between the limit ring and the inner wall of the limit groove, and the first spring is wound around the outer end of the pin rod.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) This solution uses a rotating pin mechanism to enable the manhole cover body to be easily rotated to open and locked closed, which not only simplifies the disassembly and installation process, but also greatly improves work efficiency. The sliding fit between the latch pin and the latch rod, as well as the assistance of the spring, make the disassembly and installation of the manhole cover faster and more convenient. The beveled surface setting and arc surface structure of the latch rod ensure that the inner cover can be smoothly pushed to the latch rod during installation, achieving rapid fixation.

[0020] (2) This solution uses a rotating connection setting of the pin mechanism to make the opening and closing of the manhole cover body more convenient and quick, without the need for complex tools and professional skills, thus reducing the difficulty of operation. The installation of the inner cover not only provides additional support for the manhole cover body, but also realizes real-time monitoring of the manhole cover status through its built-in pressure bag and expansion bag structure. Once the manhole cover is damaged, the top membrane will automatically bulge, serving as a warning and ensuring the safety of pedestrians and vehicles.

[0021] (3) The turn pin mechanism of this scheme ensures the stability of the manhole cover during use through the fixed connection between the turn pin plate and the manhole cover body, and the locking function of the latch assembly, preventing the manhole cover from being displaced or damaged due to external forces. The expansion bag and top membrane made of elastic wear-resistant material installed in the inner cover, as well as the setting of oil film and frosted particles, not only improve the durability of the manhole cover, but also reduce friction loss and extend the service life.

[0022] (4) The design of the resale mechanism in this solution is highly versatile and can adapt to the needs of manhole covers of different sizes and specifications. The monitoring function of the inner cover allows the status of the manhole cover to be fed back to the staff in real time, facilitating the timely detection and treatment of potential safety hazards, ensuring the safe operation of urban infrastructure. The use of fluorescent liquid ensures that the warning effect is still significant in dimly lit environments, further improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the inner cover installation structure of the present invention;

[0025] Figure 3 This is a front cross-sectional structural diagram of the present invention;

[0026] Figure 4 For the present invention Figure 3 A in the middle is an enlarged structural diagram;

[0027] Figure 5 It is a schematic side sectional structural diagram of the revolving pin mechanism of the present invention.

[0028] Description of the numbers in the figure:

[0029] 1. Fixed seat; 2. Manhole cover body; 3. Rotating pin mechanism; 31. Fixed seat; 32. Rotating pin seat; 33. Rotating pin plate; 34. Pin nail; 35. Pin slot; 36. Pin rod; 37. Horizontal through hole; 38. Vertical through hole; 39. Limiting slot; 310. Limiting ring; 311. First spring; 4. Install inner cover; 41. Grid plate; 42. Outer ring plate; 43. Liquid storage tank; 44. Pressure bag; 45. Expansion bag; 46. Top membrane; 47. Connecting hole; 48. One-way valve; 49. Second spring; 410. Pull wire; 411. Pull ring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Example 1:

[0032] See also Figure 1-5, a quickly detachable manhole cover device includes a fixing seat 1 and an installed inner cover 4, a manhole cover body 2 is installed in the middle of the upper end of the fixing seat 1, a rotation pin mechanism 3 is fixedly connected to the outer side of the upper end of the fixing seat 1, and the rotation pin mechanism 3 is fixedly connected to the manhole cover body 2, the rotation pin mechanism 3 includes a fixing seat 31, the fixing seat 31 is fixedly connected to the outer side of the upper end of the fixing seat 1, a rotation pin seat 32 is installed on the upper end of the fixing seat 31, a rotation pin slot is opened at one end of the rotation pin seat 32 near the manhole cover body 2, a rotation pin plate 33 is rotatably connected to the inner end of the rotation pin slot, and the rotation pin plate 33 is fixedly connected to the manhole cover body 2, the installed inner cover 4 is installed at the inner end of the fixing seat 1, and the installed inner cover 4 is located at the lower end of the manhole cover body 2, the installed inner cover 4 includes a grid plate 41, and the grid plate 41 is installed on the fixing seat 1, the outer end of the grid plate 41 is fixedly connected with an outer ring plate 42, and the outer ring plate 42 is in contact with the inner wall of the fixing seat 1 and is installed on the wellhead through the fixing seat 1 to serve as a support and fixing point for the manhole cover body 2. The fixing seat 1 and the manhole cover body 2 are locked and connected by the rotation pin mechanism 3 to ensure the stability of the manhole cover body 2. At the same time, the purpose of rapid disassembly and installation is achieved under the coordinated use of the fixing seat 31, the rotation pin seat 32 and the rotation pin plate 33. In addition, the installation of the inner cover 4 can not only provide auxiliary support for the manhole cover body 2, but also make the outer ring plate 42 make feedback under the force of the grid plate 41, and show it from the gap between the fixing seat 1 and the manhole cover body 2, so as to remind the staff that the manhole cover body 2 is damaged, deformed and broken.

[0033] The inner cover 4 also includes a liquid storage tank 43, which is opened inside the grid plate 41. The upper end of the liquid storage tank 43 is fixedly connected to a pressure bag 44. The upper end of the outer ring plate 42 is provided with a mounting groove. The lower inner wall of the mounting groove is fixedly connected to an expansion bag 45. The upper end of the expansion bag 45 is fixedly connected to an upper top membrane 46, and the expansion bag 45 and the upper top membrane 46 are an integrated structure. The grid plate 41 is provided with a plurality of connecting holes 47 near one end of the grid plate 41, and the connecting holes 47 are respectively connected to the expansion bag 45 and the liquid storage tank 43. When the body 2 is deformed under pressure for a long time, the grid plate 41 is squeezed to push the air pressure in the pressure bag 44 into the liquid storage tank 43, and the liquid inside it is squeezed into the expansion bag 45 from the connecting hole 47, so that the hydraulic pressure in the expansion bag 45 increases and pushes the upper top membrane 46 to bulge, so that the upper top membrane 46 overflows along the gap between the fixing seat 1 and the manhole cover body 2, which can serve as a reminder and warning. At the same time, the protrusion of the upper top membrane 46 can push out the asphalt between the fixing seat 1 and the manhole cover body 2, thereby facilitating the disassembly of the manhole cover body 2.

[0034] The inner cover 4 also includes a one-way valve 48, which is installed on the inner wall of the connecting hole 47. The one-way valve 48 can be used to guide the liquid in the liquid storage tank 43 into the expansion bag 45 to prevent the liquid from flowing back and avoid the top membrane 46 from being reset and failing to serve as a reminder.

[0035] The installation of the inner cover 4 also includes a second spring 49, and the inner wall of the connecting hole 47 is provided with a pull-out groove matching the one-way valve 48. The second spring 49 is installed in the pull-out groove. The upper end of the grid plate 41 is provided with a traction hole, and the traction hole is connected to the pull-out groove. A traction wire 410 is provided in the traction hole, and the lower end of the traction wire 410 is fixedly connected to the one-way valve 48. By pulling the traction wire 410, the one-way valve 48 compresses the second spring 49 and slides into the pull-out groove, so that the liquid in the expansion bag 45 flows back to the liquid storage tank 43, so that the top membrane 46 can be reset, which is convenient for the installation of the inner cover 4 for continuous use.

[0036] The installed inner cover 4 also includes a pull ring 411. A receiving groove is provided on the inner wall of the traction hole. The pull ring 411 is installed in the receiving groove, and the pull ring 411 is fixedly connected to the upper end of the traction wire 410. The traction wire 410 can be easily pulled through the pull ring 411. At the same time, the pull ring 411 can be hidden in it under the action of the receiving groove to prevent the pull ring 411 from being separated between the manhole cover body 2 and the installed inner cover 4.

[0037] The liquid storage tank 43 and the expansion bladder 45 are both filled with fluorescent liquid. The expansion bladder 45 and the upper top membrane 46 are both made of elastic wear-resistant material. The fluorescent liquid can make the upper top membrane 46 bulge to better display in a dim light environment, so as to warn passers-by and vehicles. In addition, the expansion bladder 45 and the upper top membrane 46 can be made of silicone material, which can not only be deformed after being subjected to force, but also be wear-resistant and corrosion-resistant, which can effectively improve its service life.

[0038] An oil film is provided at the outer end of the expansion bag 45, and a plurality of abrasive particles are provided at the upper end of the top membrane 46. The setting of the oil film at the outer end of the expansion bag 45 can better extend along the inner wall of the gap during the deformation process, thereby reducing friction, and the particles provided at the outer end of the top membrane 46 can better grind off the asphalt on the inner wall of the gap, so as to facilitate the replacement of the manhole cover body 2.

[0039] The rotation pin mechanism 3 also includes two pairs of pins 34. Two pairs of sockets are provided on the upper ends of the fixing seat 31 and the rotation pin seat 32. The two pairs of pins 34 are slidably connected to the two pairs of sockets respectively. A pair of pin grooves 35 are provided at one end of the fixing seat 31 near the installation inner cover 4. A pin rod 36 is slidably connected in the pin groove 35. A transverse hole 37 matching the pin rod 36 is provided in the middle of the pin pin 34, and a pair of vertical through holes 38 matching the pin pin 34 is provided in the middle of the pin rod 36. The two pairs of pins 34 are inserted into the two pairs of sockets. Then, with the help of the installation of the inner cover 4, the mounting inner cover 4 is used to squeeze the pin rod 36, so that the pin rod 36 slides into the pin groove 35 and is stuck in the transverse hole 37 in the middle of the pin pin 34, thereby installing and connecting the manhole cover body 2 and the fixing seat 1.

[0040] The upper end of the latch rod 36 close to the installation side of the inner cover 4 is in the shape of a bevel. By setting the end face of the latch rod 36 close to the installation side of the inner cover 4, it is better to directly and effectively squeeze the latch rod 36 when installing the inner cover 4, thereby facilitating the insertion of the latch rod 36 into the transverse hole 37 to fix the fixing seat 31 and the rotating pin seat 32.

[0041] When the cam 33 is in the unlock state, the locking cam 330 is locked and the locking cam 331 is locked, so that the cam 330 can be unlocked and the locking cam 330 can be unlocked.

[0042] Working principle:

[0043] When the manhole cover body 2 is damaged, deformed and ruptured under pressure, the force is transmitted to the installation of the inner cover 4 during the pressure process of the manhole cover body 2, so that the pressure bag 44 is stressed, so that the air pressure in the pressure bag 44 is pushed into the liquid storage tank 43, and the liquid inside it is squeezed into the expansion bag 45 through the connecting hole 47 through the one-way valve 48, so that the hydraulic pressure in the expansion bag 45 increases and pushes the top membrane 46 to bulge, so that the top membrane 46 overflows along the gap between the fixing seat 1 and the manhole cover body 2, thereby providing a warning under the action of the fluorescent liquid. After that, after the staff opens the manhole cover body 2, the installed inner cover 4 can serve as a temporary manhole cover to prevent passers-by and vehicles from falling into danger. When the inner cover 4 is installed so that it is disengaged from the abutment against the latch rod 36, the limiting ring 310 is pushed to slide under the rebound force of the first spring 311, so that the latch rod 36 slides accordingly, and the pair of vertical through holes 38 are slid to align with the pair of latch pins 34 on the same vertical line. Then, the latch pins 34 can be pulled out to remove and replace the manhole cover body 2, and the two pairs of latch pins 34 are reinserted into the two pairs of insertion holes. Then, with the help of the installation of the inner cover 4, the latch rod 36 is squeezed by the installation of the inner cover 4, so that the latch rod 36 slides into the latch groove 35 and is stuck in the horizontal through hole 37 in the middle of the latch pin 34, so that the manhole cover body 2 and the fixing seat 1 can be installed and connected.

[0044] It can be seen from the above technical solutions that the present invention has the following beneficial effects:

[0045] The present invention uses the rotating pin mechanism 3 to make the manhole cover body 2 easy to rotate to open and lock and close, which not only simplifies the disassembly and installation process, but also greatly improves work efficiency. Through the sliding cooperation between the latch pin 34 and the latch rod 36, and the assistance of the first spring 311, the disassembly and installation of the manhole cover becomes faster and more convenient. The beveled section of the latch rod 36 ensures that the inner cover 4 can be smoothly pushed to push the latch rod 36 during installation to achieve rapid fixation. The rotating connection setting of the rotating pin mechanism 3 makes the opening and closing of the manhole cover body 2 more convenient and faster, without the need for complex tools or professional skills, and reduces the difficulty of operation. Installing the inner cover 4 not only provides additional support for the manhole cover body 2, but also realizes real-time monitoring of the manhole cover status through its built-in pressure bag 44 and expansion bag 45 structure. Once the manhole cover is damaged, the top membrane 46 will automatically bulge, serving as a warning. It ensures the safety of pedestrians and vehicles; the turn pin mechanism 3 ensures the stability of the manhole cover during use through the fixed connection between the turn pin plate 33 and the manhole cover body 2, and the locking effect of the latch assembly, which prevents the manhole cover from being displaced or damaged due to external forces; the expansion bladder 45 and the upper top membrane 46 made of elastic wear-resistant material installed in the inner cover 4, as well as the setting of oil film and frosted particles, not only improve the durability of the manhole cover, but also reduce friction loss and extend the service life; the setting of the turn pin mechanism 3 is highly versatile and can adapt to the needs of manhole covers of different sizes and specifications; the monitoring function of the inner cover 4 enables the manhole cover status to be fed back to the staff in real time, which is convenient for timely discovery and handling of potential safety hazards, ensuring the safe operation of urban infrastructure, and the use of fluorescent liquid makes the warning effect still significant in dim light environments, further improving safety.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0047] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A quick-detachable manhole cover device, characterized in that: include: A fixing seat (1), a manhole cover body (2) is installed in the middle of the upper end of the fixing seat (1), a rotating pin mechanism (3) is fixedly connected to the outer side of the upper end of the fixing seat (1), and the rotating pin mechanism (3) is fixedly connected to the manhole cover body (2); The pin rotation mechanism (3) comprises a fixed seat (31), the fixed seat (31) is fixedly connected to the outer side of the upper end of the fixed seat (1), a pin rotation seat (32) is installed on the upper end of the fixed seat (31), a pin rotation slot is formed at one end of the pin rotation seat (32) close to the manhole cover body (2), a pin rotation plate (33) is rotatably connected to the inner end of the pin rotation slot, and the pin rotation plate (33) is fixedly connected to the manhole cover body (2); An inner cover (4) is installed, the inner cover (4) being installed at the inner end of the fixing seat (1), and the inner cover (4) being located at the lower end of the manhole cover body (2), the inner cover (4) comprising a grid plate (41), the grid plate (41) being installed at the inner end of the fixing seat (1), the outer end of the grid plate (41) being fixedly connected to an outer ring plate (42), and the outer ring plate (42) being in contact with the inner wall of the fixing seat (1).

2. The quickly detachable manhole cover device according to claim 1, characterized in that: The mounting inner cover (4) further comprises a liquid storage bin (43), wherein the liquid storage bin (43) is arranged inside the grid plate (41), and a pressure bag (44) is fixedly connected to the upper end of the liquid storage bin (43); a mounting groove is arranged at the upper end of the outer ring plate (42), and an expansion bag (45) is fixedly connected to the lower inner wall of the mounting groove; an upper top membrane (46) is fixedly connected to the upper end of the expansion bag (45), and the expansion bag (45) and the upper top membrane (46) are an integral structure; a plurality of connecting holes (47) are arranged at one end of the grid plate (41) close to the grid plate (41), and the connecting holes (47) are respectively connected to the expansion bag (45) and the liquid storage bin (43).

3. The quickly detachable manhole cover device according to claim 2, characterized in that: The mounting inner cover (4) further comprises a one-way valve (48), and the one-way valve (48) is mounted on the inner wall of the connecting hole (47).

4. The quickly detachable manhole cover device according to claim 3, characterized in that: The mounting inner cover (4) further comprises a second spring (49); a pull-out groove matching the one-way valve (48) is provided on the inner wall of the connecting hole (47); the second spring (49) is installed in the pull-out groove; a traction hole is provided at the upper end of the grid plate (41), and the traction hole is connected to the pull-out groove; a traction wire (410) is provided in the traction hole, and the lower end of the traction wire (410) is fixedly connected to the one-way valve (48).

5. The quickly detachable manhole cover device according to claim 4, characterized in that: The mounting inner cover (4) further comprises a pull ring (411), an accommodating groove is provided on the upper inner wall of the traction hole, the pull ring (411) is mounted in the accommodating groove, and the pull ring (411) is fixedly connected to the upper end of the traction wire (410).

6. The quickly detachable manhole cover device according to claim 2, characterized in that: The liquid storage bin (43) and the expansion bag (45) are both filled with fluorescent liquid, and the expansion bag (45) and the upper top membrane (46) are both made of elastic wear-resistant material.

7. The quickly detachable manhole cover device according to claim 2, characterized in that: An oil film is provided at the outer end of the expansion bag (45), and a plurality of frosted particles are provided at the upper end of the upper top film (46).

8. The quickly detachable manhole cover device according to claim 1, characterized in that: The rotating pin mechanism (3) further comprises two pairs of plug pins (34), the upper ends of the fixing seat (31) and the rotating pin seat (32) are each provided with two pairs of insertion holes, the two pairs of the plug pins (34) are respectively slidably connected in the two pairs of insertion holes, the fixing seat (31) is provided with a pair of plug slots (35) at one end close to the mounting inner cover (4), a plug rod (36) is slidably connected in the plug slots (35), a transverse through hole (37) matching the plug rod (36) is provided in the middle of the plug pin (34), and a pair of vertical through holes (38) matching the plug pin (34) is provided in the middle of the plug rod (36).

9. The quickly detachable manhole cover device according to claim 8, characterized in that: The upper end of the latch rod (36) close to the side where the inner cover (4) is installed is in the shape of a chamfered surface.

10. The quickly detachable manhole cover device according to claim 8, characterized in that: The rotating pin mechanism (3) further comprises a limiting groove (39), wherein the limiting groove (39) is formed on the inner wall of the latching groove (35), wherein a limiting ring (310) is slidably connected in the limiting groove (39), and the limiting ring (310) is fixedly connected to the outer end of the latching rod (36), and a first spring (311) is fixedly connected between the limiting ring (310) and the inner wall of the limiting groove (39), and the first spring (311) is wound around the outer end of the latching rod (36).

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